Venous drainage of brain

Venous drainage of brain

1. VENOUS DRAINAGE OF CEREBRUM Dr. Rati Tandon J.N.M.C.,AMU, ALIGARH

2. Veins of brain intracranial dural venous sinusesinternl jugular veins of neck. The route of blood within the head

3. Characterstic features of venous drainage of brain : Does not have arterial pattern. Extremely thin walled (absence of muscular tissue in walls). No valves. Run in subarachnoid space.

4. Michigan Neurosurgery Veins of the Head and Neck Scalp/Emissary veins Facial veins Neck veins Brain and meningeal veins Diploic veins Meningeal veins Dural sinuses Cerebral veins Superficial Deep

5. Michigan Neurosurgery Cerebral veins Superficial veins Deep veins

6. Superficial or External cerebral veins Drain the surface (cortex) of cerebral hemisphere: 3 groups: Superior cerebral veins Middle cerebral veins Inferior cerebral veins.

7. Superior cerebral veins 8 to 12 in number Drain- Superolateral and Medial surface Ascends upwards  Arachnoidmater  Subdural space  Superior saggital sinus.

8. MIDDLE CEREBRAL VEINS Four in number : 2 on each side Superficial middle cerebral vein Deep middle cerebral vein

9. Superficial middle cerebral vein : Lies superficially in lateral sulcus .

10. Anteriorly , drains into cavernous sinus. Posteriorly , communicates with Superior saggital sinus through superior anastomotic vein (of Troland ). With Transverse sinus via inferior anastomotic vein of Labbe .

11. DEEP MIDDLE CEREBRAL VEIN Lies deep in lateral sulcus . Joins anterior cerebral vein to form the basal vein.

12. INFERIOR CEREBRAL VEINS Drains : Inferior surface, Lower parts of medial and superolateral surfaces.

13. Other veins Anterior cerebral vein: - Accompanies anterior cerebral artery. - Drains medial surface.

14. Basal vein of Rosenthal: Formed at base of brain By union of three veins: Anterior cerebral vein Deep middle cerebral vein Striate vein Basal vein terminate into Great cerebral vein of Galen

15. INTERNAL CEREBRAL VEINS Each internal cerebral vein is formed at interventricular foramen of Monro . Union of three veins: Thalamostriate vein (thalamus and basal ganglia) Septal vein (septum pellucidum ) Choroidal vein (choroid plexus).

16. Two internal cerebral veins joins to form Great cerebral vein of Galen  Straight sinus.

17. Great cerebral vein of Galen Length 2cm Union of 2 internal cerebral vein Receives two basal veins too. Joins inferior saggital sinus. Drains into straight sinus.

18. Tributaries: Internal cerebral V Basal V Veins from colliculi Veins from cerebellum.

19. Venous drainage according to surfaces

20. Superolateral surface Upper part  Superior cerebral veins SSS. Lower part Inferior cerebral veinssuperficial middle cerebral vein. Posteroinferior part  Transverse sinus.

21. Inferior surface Orbital part  inferior cerebral V superficial middle cerebral V and Anterior cerebral V. Tentorial part: - to venous sinuses ( cavernous,superior petrosal , straight and transverse sinus. - Superficial middle cerebral veincavernous sinus - Basal vein straight sinus

22. Medial surface Upper part superior cerebral V superior saggital sinus. Lower partinferior cerebralinferior saggital sinus Posterior part  great cerebral vein Anterior part  anterior cerebral vein.

23. Applied anatomy Subdural haemmorhage : - rupture of cerebral veins in subdural space.

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25. Michigan Neurosurgery Deep Veins Thalamostriate vein Septal vein Internal Cerebral vein (2) Basal vein of Rosenthal (2) Occipital vein (2) Posterior Pericallosal vein (2) Mesencephalic vein (2) Precentral Cerebellar vein (1) Vein of Galen Inferior Sagittal Sinus Straight Sinus