2. INTRODUCTION
DEFINITION
EVENTS OF DEVELOPMENT
EMBRYOLOGICAL DEVELOPMENT
DEVELOPMENT OF BRANCHIAL (ARCHES ,
POUCHES AND CLEFTS)
DEVELOPMENT OF FACE
DEVELOPMENTAL ANOMALIES OF FACE
CONCLUSION
REFERENCES
3. Anatomical structures are more diverse in the mouth
than in any other region. Human development is a
continuous process and does not stop at birth. An
individual spends about 9 months/ 38 weeks/266 days or
nearly 383040minutes of his life in his mother’s womb.
The human face begins to form during the 4th week of
embryonic development. By the 6th week the external face
is completed. Between the 6th and 8th weeks the
development of the palate subdivides nasal and oral
cavities. This development continues into the 12th week
with completion of the soft palate.
4. Embryology:
Science of the origin & development of the organism
from fertilization of the ovum to the end of the eighth
week.
Development:
Development refers to all the naturally occurring
unidirectional changes in the life of an individual from
its existence as a single cell to its elloboration as a
multifunctional unit terminating in death. Thus it
encompasses the normal sequential events between
fertilization and death.
5. Third week Development of ear
Formation of Stomatodaeum.
Fourth week
Formation of Fronto-nasal process, maxillary and mandibular process.
Development of cranial base.
Formation of pharyngeal arches.
Development of tongue.
Fifth week Formation of Nasal placode, Medial and lateral nasal process.
Development of mandible.
Sixth week Development of Nasal cavity.
Development of Parotid and Submandibular salivary glands
Seventh week Formation of pre-maxilla
Eight week Formation of definitive palate.
Development of Sublingual salivary glands
Tenth week Development of TMJ
Development of Maxillary sinus.
Twelth week Development of Ethmoidal, Frontal and Sphenoidal sinuses.
6. • Pre-implantation period or Period of ovum(1-2weeks)
• Embryonic period( 3rd to 8th week)
• Fetal period( 9th week till birth)
7. - The period of one week from fertilization to
implantation of the fertilized egg is called the pre-implantation
period.
8.
9. -The period of embryo is divided into 3 stages
-PRESOMITE stage – an embryo in any stage of development before
the appearance of the first pair of somites (primitive
segments/metameres), which in humans usually occurs around 19
to 21 days after fertilization of the ovum.
-SOMITE stage - an embryo in any stage of development between
the formation of the first and the last pairs of somites, which in
humans occurs in the third and fourth weeks after fertilization of
the ovum.
-POSTSOMITE stage –
The developing embryo then gets attached to the uterine
endometrium, this is called Implantation.
After Implantation the endometrium is called Decidua.
The placenta is formed partly by embryonic structures and partly
from the decidua.
10. -Fertilization of ovum takes place in the ampulla of the
uterine tube.
When there are 16 cells the ovum is called a morula.
- - The cells of the inner cell mass rearrange to form the
embryonic disc having two germ cells namely
ECTODERM & ENDODERM and the third layer is
formed between the 2 layers i.e known as
MESODERM.
11.
12.
13.
14. - In the Fetal period all major structures are already formed
in the fetus, but they continue to grow and develop.
The last 7 months of fetal life are devoted to very rapid
growth and repositioning of body components, with
little further organogenesis or tissue differentiation.
By 3rd month sex of fetus is known. In the 4 months
human face is seen and in the Last 2 months of fetal
life fat is deposited subcutaneously
15. - Pharyngeal arches are rod like thickenings of mesoderm
present in the wall of the foregut.
- At first there are 6 arches. The 5th arch disappears and then
only 5 arches remain.
- In the interval between any two arches the endoderm
(lining of the pharynx) is pushed outwards to form a series
of pouches. These are called Pharyngeal pouches.
16. - Cartilage component :
Adapt to form Bony, Cartilagenous or Ligamentous
structures
- Muscle component :
Give rise to special visceral muscles composed of
striated muscle fibers.
- Vascular component :
Provides necessary blood supply
- Nerve component :
Enters mesoderm of the branchial arches and initiates
muscle development of mesoderm.
17.
18.
19.
20.
21. - Precursor of both the jaws:
Maxilla + Mandible
- Initially gives rise to a large mandibular
prominence.
- Gives rise to a small maxillary prominence
which extends cranioventrally.
22. COMPONENTS OF 1ST BRANCHIAL ARCH:
Cartilage : MECKEL’S CARTILAGE
-Arises in 41st – 45th Day of intrauterine life.
-It provides a template for subsequent development of
the mandible.
Derivatives of Meckel’s cartilage-
-Mental Ossicle
-Head and neck of Malleus.
-Short crus of the Incus.
-Anterior Ligament of the Malleus.
-Sphenomandibular Ligament
23. Musculature derived from 1st arch-
-Muscles of Mastication.
-Mylohyoid Muscle.
-Ant. Belly of Digastric.
-Tensor Tympani.
-Tensor Veli Palatini Muscles.
3. Arterial Component:
-Part of Maxillary and External Carotid Artery.
24. 4. Nerve components:
-- Mandibular division of Trigeminal Nerve
( Vth Cranial Nerve)
-- Sensory component supplies
: Mandible and covering mucosa.
: Mandibular teeth including Gingiva.
: Mucosa of ant. 2/3 of Tongue.
: Floor of the mouth.
: Skin of the lower third of Face
25. COMPONENTS:
1. Cartilage : Reichert’s Cartilage
(45th – 48th I.U)
- Greater part of the third ear ossicle.
- Stapes .
- Styloid process of the temporal bone.
- Stylohyoid ligament.
- Lesser horn and
- Cranial part - Body of Hyoid.
- Segments of the facial canal.
26. 2. Muscles :
- Stapedius
- Stylohyoid
- Post. Belly of Digastric.
- Muscles of facial expression.
- Levator Veli Palatini.
3. Nerve :
- Facial nerve.
- Special sensory component
- Chorda tympani nerve
(Ant 2/3rd of Tongue)
4. Artery :
- Stapedial artery
- Transient i.e. disappears during fetal life.
27. COMPONENTS:
1.MUSCLES –
STYLOPHAYNGEOUS MUSCLE
2.NERVE –
GLOSSOPHAYNGEAL NERVE
3.ARTERY-PROXIMAL
1/3RD OF INTERNAL CAROTID ARTERY.
SMALL CONTRIBUTION OF COMMON CAROTID ARTERY.
4. SKELETON –
Greater horn
Lower body of hyoid
28. COMPONENTS:
1. MUSCLES-Constrictor
muscles of pharynx.
2. NERVE –
Superior laryngeal nerve
3. ARTERY –
Arch of aorta
Proximal part of subclavian
4. SKELETON –
Thyroid cartilage
30. 1st pharyngeal pouch –
• It forms a star like diverticulum “tubotympanic recess”,
which comes in contact with the epithelial living of the 1st
pharyngeal cleft, the future external auditory meatus.
• The distal portion of the diverticulum widens into primitive
middle ear cavity and the proximal part remains narrow
forming the eustachian tube.
• The lining of tympanic cavity later aids in formation of the
tympanic membrane or eardrum.
31. 2nd pharyngeal pouch:
•The epithelium of the ventral part of this pouch
contributes to the formation of tonsil.
•Dorsal part takes part information of tubo tympanic
recess.
32. 3rd pharyngeal pouch :
•It has dorsal and ventral wings.
•During 5th week, epithelium of dorsal wing of the 3rd pouch
differentiates into inferior parathyroid gland, while ventral
wing forms the thymus.
•Thymus migrates in a caudal and medial direction pulling
inferior parathyroid with it, which finally rest on the dorsal
surface of thyroid gland.
33. 4th pharyngeal pouch:
•Epithelium of dorsal wing forms the superior parathyroid
gland.
5th pharyngeal pouch:
•Considered as a part of 4th pouch. It gives rise to
ultimobronchial body, which later forms parafollicular or “C”
cells of thyroid gland.
•These cells secrete calcitonin, hormone involved in calcium
regulation.
34.
35. • 5 week embryo is characterized by 4 pharyngeal clefts.
• Dorsal part of 1st cleft penetrates the underlying mesenchyme
and gives rise to the external auditory meatus.
• The epithelial lining at the bottom of the meatus participates in
formation of the eardrum.
• Active proliferation of mesenchymal tissue in the 2nd arch causes
it to overlap the 3rd and 4th clefts (arches).
• Finally it merges with the epicardial ridge in the lower part of
neck and the 2nd, 3rd and 4th clefts lose their contact with outside.
• These clefts form a cavity lined with ectodermal epithelium, the
“cervical sinus”, but with further development this sinus
disappears.
36. KEY POINTS:-
• Face develops from 3 prominences that surround the
stomatodeum-it is a depression bounded cranially by a
bulging produced by the brain and caudally by a bulging
produced by the pericardial cavity.
1.Frontonasal process
2.Right and Left mandibular arch
•The mandibular arch divides into a maxillary process
and a mandibular process.
•The right and the left mandibular arches meet in the
midline and fuse. They form the upper and lower lips.
37.
38.
39.
40.
41. • The cheek is formed by the fusion of posterior part of
maxillary and mandibular process.
• The nose is derived from the frontonasal process.
• The nasal cavity is formed by enlargement of the nasal
pits.
• Paranasal sinuses appear as outgrowths from the nasal
cavity.
• The palate is formed by fusion of 3 components i.e
right and left palatal processes and the primitive palate.
• The oral cavity is derived party from the
stomatodaeum(ectoderm) and partly from the
foregut(endoderm).
42. • The teeth are formed in relation to the dental lamina. An
enlargement of dental lamina for each tooth is formed which
is called the enamel organ. Ameloblasts form the enamel,
odontoblasts form the dentine and the mesenchyme that
invaginates into enamel organ forms the pulp.
• The ant. 2/3rd of the tongue is formed from the lingual
swellings and the tuberculum impar.
• The post.1/3rd of the tongue is formed by cranial part of
hypobranchial eminence.
• The salivary glands develop as outgrowths of buccal
epithelium.
• The palatine tonsil develops in relation to 2nd pharyngeal
pouch.
43. • The pharynx is derived from the foregut.
• Muscles of face develop from 2nd branchial arch and
are supplied by facial nerve.
• Eyes develop from three sources:
Neuroectodermof the forebrain - retina,optic n.
Surface ectoderm of the head - lens
Mesoderm between these layers – eye muscle and
vascular tissues.
• External ear develops from Ext. ocoustic meatus,
middle ear develops from tubotympanic recess that is
derived from 1st pouch and internal ear is derived from
otic placodewhich is a thickening of surface ectoderm.
44. The mandibular process of two sides grow towards each
other and fuse in the midline.
The fused mandibular process give rise to lower lip & to
lower jaw.
45. •Each mandibular process grows medially and fuses first with
the lateral nasal process and then with medial nasal process.
•The medial and lateral nasal processes fuse with each other n
the nasal pits(ext.nares) are cut off from stomatodaeum.
•The mesodermal basis of the lateral part of the lip is formed
from the maxillary process and the overlying skin is derived
from the ectoderm covering this process.
•The mesodermal basis of the median part of lip (philtrum) is
formed from frontonasal process.
•The skin of the entire upper lip is innervated by maxillary
nerves.
•The muscles of the face along with the lips are derived from
mesoderm of second bronchial arch, are supplied by the facial
nerve.
46.
47.
48.
49. • After the formation of the upper lip and lower lips the
stomatodaeum becomes broader.
• In its lateral part it is bounded by the maxillary
process from above and mandibular process from below.
• Progressive fusion of both the processes form the
cheek.
50. The nose is a complex of contributions from:
• Frontal prominence - The bridge.
• Medial nasal prominence - Median ridge and tip
• Lateral nasal prominence - The alae
• The cartilage of nasal capsule - the septum and
nasal conchae.
As the nose becomes prominent, the external nares
open up downwards instead of forwards.
51.
52.
53. • The nasal cavities are formed by extension of the
nasal pits. These pits are at first in open communication
with the stomatodeum. Soon the medial and lateral
nasal processes fuse, and form a partition between the
pit and the stomatodeum. This is the primitive palate
and is derived from the frontonasal process.
• A dorsal orifice that opens into the
stomatodeum- Primitive posterior nares.
• The 2 nasal sacs enlarges and bring them closer
together.
• The frontonasal process becomes narrower.
54. • The nasal cavities are separated from the mouth
by the development of palate. The narrowing of the
fronto-nasal process and the enlargement of nasal
cavities brings them closer together.
• The intervening tissues becomes much thinned
to form the nasal septum.
• The nasal pits now deepen to form the nasal sacs
which expand both dorsally and caudally. The nasal sac
has a ventral orifice that opens on the face is called the
Anterior nares.
55. • Paranasal sinuses develop during late fetal life.
• They form as outgrowths or diverticula of the
walls of the nasal cavities and become air filled
extensions of the nasal cavities in the adjacent bone.
- Frontal – 3 to 4 months of I.U
- Ethmoidal – 4 months of I.U
- Maxillary – Develops at 10 weeks of I.U
- Sphenoidal – 4 months of I.U
56. • Ear consists of 3 anatomical parts:
- Internal ear
- Middle ear
- External ear
-External ear:
External acoustic meatus:-
Develops by deepening of the dorsal end of the 1st
pharyngeal groove.
• Pinna or Auricle:
Six mesenchymal hillocks – Auricular hillocks develop
from the 1st and 2nd pharyngeal arch.
57. -Middle ear:
Develops from the tubotympanic recess i.e. derived
from the 1st pharyngeal pouch.
Tympanic cavity- Distal portion of the tubotympanic
recess expands.
Tympanic membrane: - Ectodermal lining from
-1ST pharyngeal groove
-Mesodermal lining from 1st and
2nd arch
-Endodermal lining from tubotympanic recess
58. Ear ossicles:
• 1st bone to attain ultimate size.
• Maleus and Incus develop from the 1st arch.
• Stapes develop from 2nd arch.
• Ossification begins in the 16th week and continues up
to the 25th week
-INTERNAL EAR:
• OTIC PLACODE
59.
60. • Eyes develop from three sources:
Neuroectodermof the forebrain - retina, optic nerve.
Surface ectoderm of the head- lens
Mesoderm between these layers - eye muscle and
vascular tissues
• 1st indication of eye formation is optic sulcus which is
formed in the 4th week.
61.
62. - Tongue develops in relation to P.A in floor of
developing mouth.
- The medial most part of M.A proliferate to form
Lingual swellings.
- They are partially separated from each other by
another swelling in midline called Tuberculum Impar.
- Immediately behind Tuberculum Impar the
epithelium proliferates to form a downgrowth from
(thyroglossal duct) which thyroid gland develops. This site is
marked by Foramen Caecum.
- Hypobranchial eminence- midline swelling in relation
to medial ends of 2nd, 3rd, & 4th arch. It has a cranial part
called Copula (2nd, 3rd ), & caudal part ( 4th) forming
epiglottis.
63. - Anterior two-thirds of tongue forms by fusion of –
2 lingual swellings & Tuberculumimpar
- It is derived from Mandibular arch so supplied by
lingual nerve, branch of Mandibular nerve which is
post- trematic nerve of the 1st arch & chorda- tympani
which is pretrmatic nerve of the arch.
- Posterior one-thirds is formed from cranial part
of H.E (copula)
- The 2nd arch mesoderm buries below the surface,
3rd arch mesoderm grows over it to fuse with mesoderm
of 1st arch.
- Thus it is formed by 3rd arch mesoderm.
64. Supplied by glossopharyngeal nerve, of 3rd arch.
- The posterior most part is formed from 4th arch,
so it is supplied by superior laryngeal nerve of 4th arch.
- Musculature is derived from occipital myotomes,
supplied by hypoglossal nerve.
65.
66. • Begins at 6th week- for primary palate
• From each Max. P, a plate like shelf grows medially, this
is called Palatine process.
• Palate forms from 3 components fusing with each other--
1) 2 Palatal processes, fuse in midline beginning from anterior
to posterior
2) Primitive palate from FNP, each palatal process fuses with
posterior margin of P.P
• The medial edge of P.P fuse with free lower edge of nasal
septum thus separating 2 nasal cavities from each other & from
mouth.
• At later stage mesoderm in palate undergoes
intramembranous ossification to form hard palate. Ossification
does not extend into posterior most portion which remains as
Soft palate.
• The part of palate derived from FNP is Premaxilla which
carries 4 incisors.
67. • The maxilla develops from a centre of ossification
in the mesenchyme of the 1st arch. The centre is in the
maxillary process. No arch cartilage or primary cartilage
exists in the maxillary process.
• Centre of ossification appears in the angle
between the division of the nerve, where the
anterosuperior dental nerve is given off from the infra
orbital nerve. From this centre bone formation spreads
backward below the orbit towards the developing
zygoma and forward towards the future incisor region.
68. • Ossification also spreads upward from this
forward extension to form the frontal process.
Ossification also spreads into the palatine process to
form the hard palate. A secondary cartilage, a zygomatic
or malar cartilage appears in the developing zygomatic
process and for a short time adds considerably to the
development of the maxilla.
69. - On lateral aspect of Meckel’s cartilage (1st arch
cartilage) during 6th week of embryonic development, a
codensation of mesenchyme occurs in the angle formed by
division of Inferior Alveolar Nerve and its incisive and
mental branches
- At 7th week ,intra membraneous ossification begins in
this condensation forming the 1st bone of the mandible.
From this centre of ossification, bone formation spreads
rapidly, anteriorly to the midline and backwards towards the
point where the mandibular nerve divides into lingual and
IAN branches.
70. - Ramus of mandible develops by a rapid spread of
ossification backwards into mesenchyme of 1st arch,
diverging away from Meckel’s cartilage. The point of
divergence, is marked by lingula in adult mandible,
where Inf.Alveolar Nerve enters body of mandible.
- By 10th week, rudimentary mandible is formed
entirely by membraneous ossification with no direct
involvement of Meckel’s cartilage.
- Further growth is influenced by secondary
(growth) cartilage and development of muscular
attachments. The cartilages one condylar, coronoid and
symphyseal cartilages.
71. MECKEL’S CARTILAGE:-
- Dorsal end ossifies to form malleus & incus
- Its parts then transform into sphenomandibular
ligament & ant. Malleolar ligament
- Ventral end forms accessory endochondral
ossicles
- Then between 10th -14th weeks, secondary
accessory cartilages appear to form the head of condyle,
part of coronoid process and mental protruberance. By
24th week it disappears after conception.
72.
73. Craniofacial voluntary muscles develop from somitomeres
and somites of the occipital and nostral cervical regions.
Myomeres of the somitomeres and myotomes of somites
form primitive muscles cells called myoblasts.
Myoblasts divide and fuse to form myotubes. Myotubes
become myocytes (muscle fibres).
Craniofacial muscles are derived segmentally from 7
somitomeres - 7 nostral somites ,4 ocular extrinsic
muscles(superior , medial , inferior rectus and inferior
oblique) derived from 1st two somitomores supplied by
Oculomotor.
Superior oblique ocular muscle- 3rd somitomere -Trochlear N
(4th CN).
79. There are four clinically significant types of congenital
anomaly
Malformation : A morphological defect of an organ, part of
an organ, or larger region of the body that results from an
intrinsically abnormal developmental process.
Disruption :A morphological defect of an organ, part of an
organ, or a larger region of the body that results from the
extrinsic breakdown of, or an interference with, an
originally normal developmental process
Deformation : An abnormal form, shape, or position of a
part of the body that results from mechanical forces
Dysplasia : An abnormal organization of cells into tissue (s)
and its morphological result (s).
80. Cleft palate - A congenital fissure in the roof of the
mouth, resulting from incomplete fusion of the palate
during embryonic development.
Cleft lip - A congenital deformity characterized by a
vertical cleft or pair of clefts in the upper lip, with or
without involvement of the palate. Defective fusion of
the medial nasal process with the maxillary process
leads to cleft lip
GENETIC OR ENVIRONMENTAL
INCIDENCE
81. Cleft lip is common among males while cleft palate is
more common among females.
Unilateral clefts - 80% of the incidence
Bilateral clefts - remaining 20%.
82.
83. Most accepted.
GROUP I:- cleft of the soft palate only.
GROUP II:-Cleft of the hard and soft palate to the
incisive foramen.
GROUP III:-Complete unilateral cleft of the soft and
hard palate, and the lip and alveolar ridge on one side.
GROUP IV:-Complete bilateral cleft of the soft and hard
palate ,and the lip and alveolar ridge on both sides.
84.
85. DAVIS AND RITCHIE CLASSIFICATION(1922)
Classification by Fogh Andersen (1942)
Millard’s modification of stripped Y classification
SCHUCHARDT AND PFEIFER’S SYMBOLIC
CLASSIFICATION
87. Congenitally missing teeth (most commonly the upper
laterals)
Presence of natal or neonatal teeth
Presence of supernumerary teeth
Ectopically erupting teeth
Anomalies of tooth morphology
Enamel hypoplasia
88. Microdontia
Fused teeth
Macrodontia
Mobile and early shedding of teeth due to poor
periodontal support
Posterior and anterior cross bite
Protruding premaxilla
Deep bite
Spacingcrowding
89. The clefts involving the lip can result in facial
disfigurement varing from mild to severe. The oro-facial
structures may be malformed and congenitally
missing. Deformities of nose can also occur. Thus
esthetics is greatly affected.
90. Cleft lip and palate are sometimes associated with
disorders of the middle ear which may affect hearing.
The presence of hearing problems can cause
difficulties in language uptake and speech.
91. Due to their abnormal facial appearance they have to
put up with staring, curiosity, pity, etc.,.
They also face problems in obtaining jobs and making
friends.
Studies have shown that these patients fare badly in
academics. This is usually as a result of hearing
impairment, speech problems and frequent absence
from school.
93. TURNER’S SYNDROME:-
Turner syndrome is caused by the absence of two
complete copies of the X chromosome in some or all the
cells.
94. Multiple eye findings including cataract, blue sclera.
Color Blindness
Depressed Corners of mouth
High arched palate
Dental malocclusion
Micrognathia
95.
96. TRISOMY 21/DOWNS SYNDROME/MONGOLISM:-
C/F:-
Hypoplastic maxilla and nasal bones
Flattening of nasal bridge, orbital ridges, and maxilla
Short hard palate
Cleft lip/palate about 3 times frequency in normal
population
Protruding fissured tongue with hypertrophy of
papillae
Dentition delayed, increased periodontal disease, and
reduced dental caries
97.
98. CROUZONS SYNDROME/CRANIOFACIAL
DYSOSTOSIS:-
C/F:-
Premature closure, especially of coronal suture,
occasionally lambdoidal..
Variable cranial form depending on order and rate
of progression of suture closure
Optic nerve damage
99. High arched palate
V-shaped maxillary dental arch.
Crowding of the upper teeth.
Class III Malocclusion
Bilateral Atresia of Auditory meatus noted
occasionally
Mental retardation occasionally seen
anomalies of the hands and feet may or may not occur.
100. craniofacial defect involving with neural crestal cells
include:
Treachers colins yndrome
Pierre Robin syndrome
De george anomaly
Occuloauriculo vertbral spectrum(golden har syndrome)
101. C/F:
under development of the zygomatic bones,
mandibular hypoplasia, down slanting palpebral
fissures, maformed external ears
Autosomal dominant trait with 60% cases
102.
103. Macrostomia
Hypoplastic mandible with concave undersurface
Hypoplastic zygomatic arches
cleft palate
Dental malocclusion common
Pinna frequently deformed, crumpled forward, or
misplaced
Absence of external auditory canal
104. Altered first arch structure
Occur independently or in association with other
malformations
Development of mandible most severely affected
micrognathia, cleft palate and glossoptosis (posteriorly
placed tongue)
Robin’s syndrome may be due to genetic or environmental
factors
May also occur as a deformation
The primary defect includes poor growth of the mandible
and as a result a posteriorly placed tongue that fails to drop
from between the palatal shelves preventing their fusion
105.
106. Autosomal dominant trait
C/F_-
prominent supraorbital ridges
Long narrow face
High arched palate
Mandibular prognathism
Myopia
Blue sclerae
Chest deformities
Hyperextensibility of joints
Hernias
Muscular underdevelopment
107.
108. Characterized by :
have immunological deficiencies, hypocalcaemia and
poor prognosis
Origin of the defect is caused by abnormal
development of neural crest cells that contribute to
formation of all affected structures
In addition to genetic causes , alcohol and maternal
diabetes can produce such defect
defects in the palate
mild differences in facial features,
109.
110. craniofacial abnormalities involving the maxillary ,
temporal and zygomatic bones which are small and
flat
Ear (anotia-no ear), eye(tumors and dermoid in eye
balls)
Asymmetry -65% cases
Other malformation-tetralogy of fallot (con.heart
disease) , malformations of kidney and intestine
114. Also called cleft lip syndrome
Also called lip pit syndrome
Characterized by :
lip pits
Absent teeth
Isolated cleft lip and palate
Abnormal fusion of palate and lips
Both genders are equally affected
Unilateral or bilateral lip pits
classical symptoms is its association with cleft lip and cleft palate
Usually medial or vermilion portion of the lower lip
Associated with accessory salivary glands that empty into pits .
Patients may have maxillary hypodontia.
Missing maxillary pre molars
115. Localized hyperplasia/ hypertrophy of minor
accessory glands
Aplasia :
Development of xerostomia
Found in cases of hemifacial microsomia
treacher collin’s syndrome
117. Macrostomia
Microstomia
Congenital lip pits:
malformation of lips
Following heridetary pattern
May occur alone or with association with other anamolies
mainly cleft lip and palate due to notching of lip at an early
stage of development with fixation of tissue at the base of
the notch or from failure of complete union of embryonic
lateral sulci of lip which persist and ultimately develop into
typical pit.
118. Characterized by:
Unilateral or bilateral depression
On vermillion surface of either lip
More commonly on lower lip
Sparse mucous secretion may exude from the base of
the pit .lips might be swollen
120. Congenital deafness
Absence of the tympanic cavity and external meatus
Abnormal development of membranes and bony labyrinth
Malformation of auditory ossicles and ear drum
Caused by:
Rubella virus
Poliomyelitis
Erythroblastosis fetalis
Diabetes
Hypothyroidism
toxoplasmosis
121. EXTERNAL EAR DEFECTS:-
Pre auricular appendages and pits:
Skin tags and shallow depression - anterior to the ear
Pits may indicate abnormal development of the
auricular hillocks here as appendages may be caused
by accessory hillocks
123. AGNATHIA
MICROGNATHIA
MACROGNATHIA
C/F:
Mandibular protrusion (when mandible is affected)
"Gummy smile" (when maxilla is affected)
Ramus of mandible forms a less steep angle with body of
mandible
Mandibular prognathism caused by excessive condylar
growth
Chin appears prominent
124.
125. FACIAL HEMIHYPERTROPHY:-
Asymptomatic growth of one or more body parts
Involvement of one side of the face
FACIAL HEMIATROPHY:-
Slowly progressive atrophy of soft tissue of essentially
half the face characterized by progressive wasting of
sub cutaneous fat accompanied by atrophy of skin ,
cartilage , bone and muscle.
Occasionally spread one side of neck and body
126. Clinical features :
commonly early sign is painless cleft near the midline of face or
forehead
The marks the boundary between the normal and atrophic tissues
Bluish hue may appear in the skin overlying atrophic fat
Neurolgical disorders in 15 % cases may be accompanied by
pigmentation, pigmented facial naevi, contralateral jacksonian
epilepsy , trigeminal nerve , occular complications.
More in female, more on left side
Occurs mostly 1st and 2nd decade
Dental abnormalities:
incomplete root formation
Delayed eruption
Severe facial asymmetry difficulty with mastication
127. In 1897 Marie and Sainton coined the name cleidocranial
dysostosis
Autosomal dominant(A gene on one of the non-sex
chromosomes that is always expressed, even if only one
copy is present) with wide variability in expression.
C/F:
shortness of stature.
Brachycephaly(head is disproportionately wide) with
bossing of frontal, parietal, and occipital bones;
Mineralization of sutures
Late or incomplete development of accessory sinuses
128.
129. Small sphenoid bones.
Midfacial hypoplasia with low nasal bridge, narrow high-arched
palate.
Hypertelorism(abnormal increased distance between 2 organs or
body parts)
small thorax with short oblique ribs.
Dentition:-
Late eruption,
Malformed roots,
Retention cysts,
Enamel Hypoplasia,
Caries,
Supernumerary teeth.
130. Atresia (is a condition in which a body orifice or passage in
the body is abnormally closed or absent) of the cavity at the
external nares, at the posterior nasal aperture or in the cavity
This may be unilateral or bilateral
Congenital defect in the cribriform plate of ethmoid bone
may lead to communication between cranial cavity and
nose
Nasal septum may not be in midline i.e., deflected to one
side
Septum may be absent
Nasal cavity may communicate with the mouth
131. Teratogens are any agents from the environment that
can cause harm to the developing fetus.
Many harmful agents cause damage only if exposure
occurs during a sensitive period of prenatal
development.
Critical factors that influence the degree of harm a
teratogen will cause:
– The amount and length of exposure
– Individual differences in susceptibility
132. Damage from teratogens is not always evident at birth
but may appear later in life.
Impact of teratogens often depends on quality of
postnatal environment.
About 45% or more pregnancies end in miscarriage,
that is, spontaneous abortion.
Most miscarried fetuses have severe defects, such as
missing chromosomes, that make further development
impossible.
Ninety percent of fetuses that survive the danger of
miscarriage are born normal
133. RISK FACTORS:-
SMOKING
ALCOHOL
DIETARY DEFICIENCIES
DISEASES viz. cytomegalovirus, herpes virus, parvovirus B19,
rubella virus (German measles), syphilis, toxoplasmosis,
Venezuelan equine encephalitis virus
DRUGS viz
Aspirin
- pregnant women - blood disorders in offspring.
Thalidomide
- deformations of the eyes, nose, ears cleft plate, facial palsy and
fusing of fingers and toe , dislocations of the hip joint and
malformations of the heart and digestive and urinary tract
134. Illegal drugs
Marijuana:
prenatal exposure to marijuana leads to infants reduced
weight and size, short term changes in behaviour e.g.
increased startle and a high pitched cry.
Cocaine:
effect of maternal cocaine use - children tend to be
impulsive, highly distractable and difficult to control
and to have problems in language development as they
grow old.
135. Father’s exposure to toxin viz Lead , Mercury ,
Radiation.
Fetal alcohol syndrome
Congenital facial paralysis:
Traumatic congenital facial nerve paralysis usually
resolves spontaneously and does not require surgery.
136. Cephalic disorders are congenital conditions that stem
from damage to, or abnormal development of, the
budding nervous system.
ANENCEPHALY is a neural tube defect that occurs
when the cephalic (head) end of the neural tube fails
to close, usually between the 23rd and 26th days of
pregnancy, resulting in the absence of a major portion
of the brain, skull, and scalp.
137. HYDRANENCEPHALY is a rare condition in which the
cerebral hemispheres are absent and replaced by sacs filled
with cerebrospinal fluid.
INIENCEPHALY is a rare neural tube defect that combines
extreme retroflexion (backward bending) of the head with
severe defects of the spine.
MEGALENCEPHALY, also called macrencephaly, is a
condition in which there is an abnormally large, heavy, and
usually malfunctioning brain.
MICROCEPHALY is a neurological disorder in which the
circumference of the head is smaller than average for the
age and gender of the infant or child
138. The human face is a fascinating study of physiology and
psychology. The amount of information a human face
can relay is unending. Humans are capable of making
10,000 unique facial expressions! While the face is
complicated, it is also our most useful and most
underestimated tool for communication.
Notas do Editor
.
After the formation of the head fold the developing brain and the pericardium form two prominent bulgings on the ventral aspect of the embryo .These bulgings are separated by stomatodeum .
The proliferation of mesoderm covering the forebrain forms the frontonasal process .
The mandibular arch gives off a bud from its dorsal end – maxillary process
Nasal placodes – formed due to the bilateral localized thickening of the frontonasal process.
Nasal pits – nasal placodes sink below the surface to form nasal pits. The edge of each pit are raised above the surface.
The medial raised edge is called medial nasal process.
lateral edge is called lateral nasal process.
Anatomical structures are more diverse in the mouth than in any other region. Human development is a continuous process and does not stop at birth. The human face begins to form during the 4th week of embryonic development. By the 6th week the external face is completed. Between the 6th and 8th weeks the development of the palate subdivides nasal and oral cavities. This development continues into the 12th week with completion of the soft palate.
The recognition of craniofacial anomalies in both animals and humans was probably first recorded by the Babylonians. They were the earliest civilization to leave records indicating that malformed infants foretold the future
The incidence different among different races.
An incidence of 1 in every 600-1000 births in India. The Negroid race - least incidence (one in every 2000 births). Mongoloids have the highest incidence.
Lip-alveolus-premaxilla-hardpalate-softpalate-submucous cleft
It’s a numerological method but its inadequate n varying complexities
COINED BY HENRY TURNER IN 1938
In 1866 Langdon Down first described this syndrome.
Commonly affecting man.
In 1912 crouzon first described a woman and her son with this disorder.
In 1915 he reported a family in which seven of twenty one members affected and thus stressed the genetic aspects of the syndrome.
Neural crest cells are a multipotent, migratory cell population unique to vertebrates that gives rise to a diverse cell lineage including melanocytes, craniofacial cartilage and bone, smooth muscle, peripheral and enteric neurons and glia(cells that protect neurons).
In 1900 Treacher Collins described. congenital deformity of structures derived from first and second branchial arches. some cases - due to teratogens
In 1963 Gorlin suggested the name Oculoauriculovertebral syndrome
Also called golden har syndrome
Dev anomaly of 1st and 2nd branchial arch syndrome
tongue-Red rhomboidal shaped smooth zone may be present on tongue in front of foramen caecum
It is considered to be result of persistence of tuberculum impar.
Salivary gland is absent , unilaterally or bilaterally
Atresia:
Congenital absence or closure of one or more of major salivary glands ducts
Aberrancy:
Presence of accessory glands in lips , palate , buccal mucosa, floor of the mouth, tongue, retromolar area.
Glands found further than normal from the usual position.
Macrostomia-inadequate fusion of mandible and maxillary process leading to abnormally wide mouth
Microstomia- too much fusion results in small mouth
Unilateral or bilateral
Corner of the mouth
Bifid nose:
Associated with median cleft lip
Due to bifurcation of the fronto nasal process
Occasionally one half of the nose is absent
Proboscis:
Cylindrical projection - just below forehead
some time affect only one half of nose and is dually associated with fusion of eyes
Fetal alcohol syndrome (FAS) is a pattern of mental and physical defects that can develop in a fetus in association with high levels of alcohol consumption during pregnancy. Alcohol crosses the placental barrier and can stunt fetal growth or weight, create distinctive facial stigmata, damage neurons and brain structures, which can result in psychological or behavioral problems, and cause other physical damage.The main effect of FAS is permanent central nervous system damage, especially to the brain