Arachnoid granulations are prolongations into the dural sinuses whose function is to reabsorb cerebrospinal fluids and return them into the bloodstream. The structure at the end of the arrow is an arachnoid granulation.
What are arachnoid granulations?
Arachnoid granulations are prolongations of the arachnoidal membrane toward the dural sinuses that filter and reabsorb cerebrospinal fluid.
These prolongations are lined by a thin layer of granulosa cells of the arachnoid and by endothelial cells of the vein wall. They have several capillaries.
Cerebrospinal fluids flow and are reabsorbed into the bloodstream through this permeable membrane that covers them.
Their main function is then to return cerebrospinal liquid to the venous circulation.
Arachnoid granulations are usually small-sized. However, when they reach a certain size, they are recognized as giant arachnoid granulations. At this point, they can occupy and dilate the dural venous sinuses and even cause expansion of the internal cranial table.
The structure at the end of the arrow is an arachnoid granulation.
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