70. VENOUS DRAINAGE OF THE BRAIN Flashcards
What is the venous drainage of the brain responsible for?
Venous drainage of the brain drains deoxygenated blood and metabolic wastes.
What are the dural venous sinuses?
Dural venous sinuses are specialized spaces between layers of dura mater where blood from the brain is collected before draining into the internal jugular vein.
Where does the superior sagittal sinus run and what does it drain?
The superior sagittal sinus runs along the midline of the brain and drains blood from the cerebral veins, emptying into the confluence of sinuses.
Where does the lower sagittal sinus run and what does it drain into?
The lower sagittal sinus runs along the lower margin of the falx cerebri and drains into the straight sinus.
What do the transverse sinuses drain into?
The transverse sinuses drain blood from the superior sagittal sinus and straight sinus and empty into the sigmoid sinuses.
Where do the sigmoid sinuses empty?
The sigmoid sinuses go around the sides of the brainstem and ultimately empty into the internal jugular veins.
What is cerebral venous thrombosis?
Cerebral venous thrombosis occurs when there is a thrombosis in the venous dural sinuses, specifically the superior sagittal sinus, which can lead to increased intracranial pressure and be life-threatening.
What drains blood from the cerebellum and brainstem?
Blood from the cerebellum and brainstem is drained by the inferior petrosal sinuses.
What veins are involved in the venous drainage of the brain?
The veins involved in the venous drainage of the brain include the dural venous sinuses, superior sagittal sinus, inferior sagittal sinus, transverse sinuses, sigmoid sinuses, and internal jugular veins.
