venous drainage of brain

VENOUS DRAINAGE OF CEREBRUM

Dr. Rati TandonJ.N.M.C.,AMU,

ALIGARH

Veins of brain intracranial dural venous sinusesinternl jugular veins of neck.

The route of blood within the head

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.

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Veins of the Head and Neck

Scalp/Emissaryveins

Facialveins

Neckveins

Brain and meningealveins

Diploicveins

Meningealveins

Dural sinuses

Cerebralveins

Superficial Deep

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Cerebral veins

Superficial veins

Deep veins

Superficialor

External cerebral veins

Drain the surface (cortex) of cerebral hemisphere:

3 groups:1. Superior cerebral veins2. Middle cerebral veins3. Inferior cerebral veins.

Superior cerebral veins

- 8 to 12 in number- Drain- Superolateral and Medial surface- Ascends upwardsArachnoidmater Subdural space Superior saggital sinus.

MIDDLE CEREBRAL VEINS

Four in number : 2 on each side

- Superficial middle cerebral vein- Deep middle cerebral vein

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

- 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.

DEEP MIDDLE CEREBRAL VEIN

Lies deep in lateral sulcus.

Joins anterior cerebral vein to form the basal vein.

INFERIOR CEREBRAL VEINS Drains :

- Inferior surface,- Lower parts of medial and superolateral

surfaces.

Other veins Anterior cerebral vein:

- Accompanies anterior cerebral artery.- Drains medial surface.

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

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).

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

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.

Tributaries:

- Internal cerebral V- Basal V- Veins from colliculi- Veins from cerebellum.

Venous drainage according to surfaces

Superolateral surface Upper part

Superior cerebral veins SSS.

Lower part Inferior cerebral veinssuperficial middle cerebral vein.

Posteroinferior part Transverse sinus.

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 veincavernous sinus

- Basal vein straight sinus

Medial surface Upper

partsuperior cerebral V superior saggital sinus.

Lower partinferior cerebralinferior saggital sinus

Posterior part great cerebral vein

Anterior part anterior cerebral vein.

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

space.

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Deep VeinsThalamostriate vein Septal vein

Internal Cerebral vein (2)

Basal vein ofRosenthal (2)

Occipital vein (2)

PosteriorPericallosal

vein (2)Mesencephalic

vein (2)PrecentralCerebellar

vein (1)

Vein of Galen Inferior Sagittal Sinus

Straight Sinus