Dural sinuses of skull and brain, structure, clinical importanc3e

2. Pronograde
Quadruped - vertebrate
Orthograde – plantigrade
Biped – erect - vertebrate

3. Splanchnocranium
Neurocranium
Telencephalisation
Inversely proportional

4. Blood supply of brain Venous drainage of brain
Brain – Internal carotid
- Vertebral art.
- Choroid plexus
Skull – Mid.Meningeal art.
(Foramen spinosum)
Br. of 1st
part Max.art.
(Ext. Carotid art.)
Brain – Ext.cerebral veins
- Ineter. cerebral veins
- Terminal veins
- Great cerebral vein
(Union of 2 int.cereb.veins)
- Basal veins
(Drain into Grt.Cereb.vein)
Skull - Diploic veins
- Emissary veins
Ventricles - CSF
Ultimately drain into
Venous sinuses
Internal Jugular Vein

5. Skull bones coverings
Scalp
Diploe
Pericranium
Dura

6. Skull bones coverings
Diploe
Endocranium + Dura
Outer table
Inner table
Arachnoid
Piamater

7. Emissary
vein Dipoeic
vein
Cerebral
vein
CSF through
Archnoid granulation
Sup.Sag.
Sinus

8. Diploic veins
Posterior temporal
Occipital
Anterior temporal
Frontal

9. Dural Lacnua
Dural Veins
Sup.Sag.Sinus

10. Sup. Cerebral veins
Sup. Middle
Cerebral vein
Sup. Anastomotic
vein
Inf. Cerebral veins
Transverse
sinus Sigmoid
sinus

11. ARTERIAL SUPPLY OF
SKULL BONES
Middle Mewningeal art.
Through Foramen Spinosum
(Br. of 1st
part of Maxillary art.)
From Ext. Carotid

12. Norma Frontalis

13. Norma Lateralis

14. Norma Basalis

16. Skull
Sagittal section

17. Dural venous sinuses
Unpaired
1. Superior sagittal
2. Inferior sagittal
3. Striaght
4. Occipital
5. Ant. Intercavernous
6. Post.Intercavernous
7. Basilar venous plexus
Paired
1. Transverse
2. Sigmoid
3. Cavernous
4. Sup. Petrosal
5. Inf. Petrosal
6. Sphenoparietal
7. Petrosquamous
8. Middle meningeal

18. Sphenoparietal
Cavernous
Ant. intercavernous
Sup. petrosal
Inf. petrosal
Transverse
Sigmoid
Occipital

19. Superior sagittal sinus
Tributaries
– Sup. Cerebral veins
- Diploic & Emissary veins through lacunae
Communications
- Veins of scalp thro’ emissary veins
- Vein from nose thro’ foramen caecum (rare)
- Cavernous sinus thro’ sup. anastomotic vein
Applied anatomy
- Infection from nose, scalp, diploic tissue
leads to thrombosis of sup/sag. Sinus
- Defective absorption of CSF
- increased intracranial tension

22. Falx. Cerebri
Falx. Cerebelli
Great
Cerebral
Vein
Sup. Sag.Sinus
Inf. Sag.Sinus

23. Sup.sag.sinus
Cerebral fossa
Transverse sinus
Straight sinus
Falx cerebri
Falx cerebellii
Cerebellar fossa
Coron. Section at Foramen magnum

25. Wall of groove for
Sigmoid sinus
Mastoid antrum
Facial n.