Cerebrospinal fluid (CSF) is primarily absorbed by arachnoid granulations located in the superior sagittal sinus (SSS). These granulations act as one-way valves, allowing CSF to flow from the subarachnoid space into the blood circulation based on a pressure gradient.
Here's a breakdown:
- Arachnoid Granulations: These are outpouchings from the subarachnoid space into the superior sagittal sinus. They are the main structures responsible for CSF reabsorption (18-Apr-2018).
- Superior Sagittal Sinus (SSS): A large venous sinus running along the midline of the brain, where the arachnoid granulations release the CSF back into the bloodstream (18-Apr-2018).
- Pressure-Dependent Gradient: CSF flows into the blood when the pressure in the subarachnoid space is higher than the pressure in the SSS (18-Apr-2018).
In short, the CSF circulates around the brain and spinal cord and is then reabsorbed into the bloodstream via the arachnoid granulations within the superior sagittal sinus.
