Main Entry: arachnoid granulation Function: noun : any of the small whitish processes that are enlarged villi of the arachnoid membrane of the brain which protrude intothe superior sagittal sinus and into depressions in the neighboring bone called also arachnoid villus,pacchionian body
arachnoid granulationn. Any of numerous villuslike projections of the cranial arachnoid through the dura into the superior sagittal sinus or into its lateral venous lacunae. Also called arachnoid villus, pacchionian body.
