The nasal cavity is divided by the nasal septum into left and right cavities. Each cavity has a roof, floor, lateral wall, and medial wall. The lateral wall contains 3 conchae, 3 meatuses, openings of the paranasal sinuses and nasolacrimal duct. The mucous membrane lining the nasal cavity includes olfactory mucosa in the upper regions and respiratory mucosa in other areas. The nose receives nerve supply from the olfactory and general sensory nerves and blood supply from arteries of the face and skull. Lymph from the nose drains to cervical lymph nodes in the neck.

1. Anatomy of
The Nose
Prepared By: Dr. Kamal Motawei
College of Medicine
Anatomy Dept.
2013-2014

2. External nose

3. External nose: neurovascular supply

4. Nasal cavity
The nasal cavity is divided by a septum into two cavities; each has:
•Roof: sphenoid, cribriform plate of ethmoid, frontal, nasal
•Floor: hard palate (palatine process of the maxilla and tr. pr. of palatine bone)
•Lateral Wall: ethmoid, maxilla, lacrimal, palatine, sphenoid, inferior concha.
•Medial Wall:
nasal septum

6. Lateral Wall of the nose
•It shows 3 conchae
•It shows 3 meatuses & shenoethmoidal recess
•It receives the openings of the paranasal sinuses and nosolacrimal duct.
•It shows the agger nasi

7. Lateral Wall of the nose
•Bulla ethmoidalis
•Hiatus semilunaris & infundibulum

8. Openings in the lateral wall

9. Medial wall (nasal septum)
•Perpendicular plate of the ethmoid & vomer.
•Septal cartilge

10. Mucous membrane
•Olfactory mucous membrane: lines the roof, the upper surface of the superior concha and a corresponding area on the nasal septum.
•Modified skin: lines the vestibule.
•Respiratory mucous membrane: lines the rest of the nasal cavity

11. Nerve supply
•Olfactory nerve
•Nerves of general sensation:
–Ophthalmic n: ant. ethm. n.
–Maxillary n: nasal, nasopalatine & palatine br. of the pterygopalatine ganglion.

12. Vascular supply
Arterial supply:
–Sphenopalatine a.: from the maxill.a.
–Ant. & post. Ethmoidal a. from the ophthalmic a.
–Lateral nasal and septal branches from the facial a.
Venous drainage:
a rich venous plexus is found under the mucous membrane which is drained by veins accompanying the arteries
Lymph drainage:
Vestibule drains into the submandibular L.N.
Rest of the nasal cavity drains into the upper deep cervical L.N.

14. Epistaxis
•Bleeding from the nose may be:
• Venous (from the venous plexus)
•or arterial mostly occurs on the anteroinferior part of the septum from the anastomosis between the septal branch of the superior labial br. of the facial artery and the shenopalatine artery in the vestibule.

15. Paranasal sinuses
•Def.: air-filled cavities in the bones surrounding the nose.
•Where!: frontal, ethmoid, sphenoid,maxilla
•Why! :resonance of the voice, lightening the weight of the skull & air conditioning.
•When!: appear after birth (only the maxillary and sphenoid sinuses appear at birth) and grow with age.

20. Development with age