arachnoid granulation

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Related to arachnoid villus: choroid plexus, hydrocephalus

arachnoid granulation

Folds of the arachnoid layer of the cranial meninges that project through the inner layer of dura mater into the superior sagittal sinus and other venous sinuses of the brain. Through them, cerebrospinal fluid re-enters the bloodstream.
Synonym: arachnoid villus; pacchionian body
See also: granulation