Arachnoid granulations serve to reabsorb CSF into which venous structure?

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Multiple Choice

Arachnoid granulations serve to reabsorb CSF into which venous structure?

Explanation:
CSF is returned to the bloodstream through arachnoid granulations, which are protrusions of the arachnoid mater that extend into the dural venous sinuses. These granulations act as one‑way outlets, allowing cerebrospinal fluid from the subarachnoid space to pass into the venous blood within the sinuses (most commonly the superior sagittal sinus) and thereby maintain proper CSF volume and pressure. Lymphatic vessels are not the drainage route for CSF, arterial sinuses aren’t involved in CSF absorption, and the subarachnoid space is where CSF resides, not where it is absorbed into the blood.

CSF is returned to the bloodstream through arachnoid granulations, which are protrusions of the arachnoid mater that extend into the dural venous sinuses. These granulations act as one‑way outlets, allowing cerebrospinal fluid from the subarachnoid space to pass into the venous blood within the sinuses (most commonly the superior sagittal sinus) and thereby maintain proper CSF volume and pressure. Lymphatic vessels are not the drainage route for CSF, arterial sinuses aren’t involved in CSF absorption, and the subarachnoid space is where CSF resides, not where it is absorbed into the blood.

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