arachnoid granulations(redirected from pacchionian corpuscles)
tufted prolongations of pia-arachnoid, composed of numerous arachnoid villi that penetrate dural venous sinuses and effect transfer of cerebrospinal fluid to the venous system. In older people, these are more numerous and tend to calcify.
clumps of arachnoid villi that project into the superior sagittal sinus.
arachnoid granulationsSmall fibrovascular nodules located on the superior sagittal sinus and adjacent venous lacunae, which are responsible for reabsorbing cerebrospinal fluid.
a·rach·noid gran·u·lat·ions(ă-rak'noyd gran-yū-lā'shŭnz) [TA]
Pacchioni,Antonio, Italian anatomist, 1665-1726.
pacchionian bodies - tufted prolongations of pia-arachnoid. Synonym(s): arachnoid granulations; pacchionian corpuscles; pacchionian glands; pacchionian granulations
pacchionian corpuscles - Synonym(s): pacchionian bodies
pacchionian depressions - pits on the inner surface of the skull in which are lodged the arachnoidal granulations. Synonym(s): granular pits
pacchionian glands - Synonym(s): pacchionian bodies
pacchionian granulations - Synonym(s): pacchionian bodies
1. resembling a spider's web.
2. the delicate membrane interposed between the dura mater and the pia mater, and with them constituting the meninges. Called also arachnoidea.
cerebral arachnoid, arachnoidea cerebri
the arachnoid investing the brain.
cysts of the pia and arachnoid containing cerebrospinal fluid; may cause gradually increasing pressure on nervous tissue, especially spinal cord, causing ataxia, paresis.
villous enlargements of the arachnoid that protrude into dural sinuses or diploic veins and serve to drain cerebrospinal fluid. They are conspicuous in the dorsal sagittal sinus of the horse.
arachnoid; middle layer of the meninges.
the arachnoid investing the spinal cord.