arachnoid villi


Also found in: Dictionary, Thesaurus, Medical.
Related to arachnoid villi: hydrocephalus, choroid plexus

arachnoid villi

[ə′rak‚nȯid′vil·ē]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
INPH is a disorder of CSF circulation, probably related to decreased absorption at the arachnoid villi leading to ventriculomegaly (Kernich, 2006).
Here, CSF enters projections of the arachnoid membrane, the arachnoid villi. These villi, collectively referred to as granulations, act as one-way valves allowing outflow of CSF into the venous circulation.
After completing its flow through the central nervous system, the CSF is absorbed by the arachnoid villi in the subarachnoid space.
The arachnoid villi are small finger-like projections that consist of the same cellular and septal mesh that forms the structure of the arachnoid, but with less septation and larger spaces.
NPH has no known cause, but has been attributed to fibrosed arachnoid villi. Arachnoid villi are finger-like projections that help absorb CSF.
Chronic hydrocephalus develops secondary to inflammation and scarring of arachnoid villi and CSF pathways (aqueduct of Sylvius, foramen of Monro, foramen of Luschka, and formen of Magendie).