What fits in the granular foveolae
- Granulationes arachnoideales. This is a chorionic projection of the subarachnoid space into the sagittal sinus and diploic veins. It has been said that arachnoid granulations are associated with drainage of cerebrospinal fluid, but this is incorrect. The capillaries of the choroid plexus and periventricular organs are windowed, and cerebrospinal fluid is absorbed through the venous capillaries here. Experiments with markers in cerebrospinal fluid have shown that they are not absorbed by arachnoid granulations. Arachnoid granules help reduce cerebrospinal fluid pressure.(Hashimoto K : Dai san no taieki junkan [Third body fluid circulation], Free Press, Tokyo, 2000, ISBN:479523048X)。