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sagittal sinus

The Superior Sagittal Sinus (SSS) runs along the top of the brain. Structures called the Arachnoid Villi are attached to the SSS and are the main site of reabsorbtion of cerebrospinal fluid (CSF) back into the blood. The mechanism whereby the CSF is absorbed into the blood is the difference in hydrostatic pressure between the two fluids. The arachnoid villi enlarge with age to form bulb-like granulations. They are covered by a smooth endothelium that prevents the veneous blood actually entering the central nervous system (CNS).

Sagittal Sinus links:
The superior sagittal venous sinus
Arachnoid granulations in lateral lacunae of the superior sagittal sinus
T2-weighted structural MR: Slice 31
Dorsal view of human brain in meninges

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