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arachnoid granulations


Definition: 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.

Synonym(s): arachnoidal granulationsTA, granulationes arachnoideaeTA, pacchionian bodies, pacchionian corpuscles, pacchionian glands, pacchionian granulations

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.