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connective tissue membranes; Dura mater: superficial, Arachnoid mater: middle, Pia mater: bound tightly to brain; Spaces: subdural, Subarachnoid
(tough mother) superficial, tightly bound to internal periosteum exept: Falx, cerebri, Tentorium cerebelli, Falx cerebelli, Venous sinuses
thin, delicate CT membrane closely adhered to brain; follows external contours of brain and dips into every sulci and covers every inch of space
between dura and arachnoid mater; only small amount of serous fluid within; keeps dura and arachnoid from sticking together
between arachnoid and pia mater; contains web-like strands of arachnoid, blood vessels, and cerebrospinal fluid; contains all nutrients that feed CNS
Blood Supply to Brain
brain requires tremendous amound of blood; receives 15-20% of blood pumped by heart; interruption can cause unconsciousness and irreversible brain damage; receives blood from arteries; Blood brain barrier
Vertebral Arteries to Brain
join to form the basilar artery; usually see anurism with blockage of basilar artery
Carotids to Brain
carotids plus basilar form the cerebral arterial circle (cicle of willis); provides rest of artories to brain
Blood Bain Barrier
3 things that regulate what goes to CNS: 1)endothelial cells (lining all capillaries) have tight junctions between them; 2)Astrocytes have foot processes that influence capillary permeability; 3)Basement membrane of endothelium
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