arachnoid

views updated May 29 2018

a·rach·noid / əˈrakˌnoid/ • adj. like a spider or arachnid.• n. (also arachnoid membrane or arachnoid mater) Anat. a fine, delicate membrane, the middle one of the three membranes or meninges that surround the brain and spinal cord.

arachnoid

views updated May 14 2018

arachnoid (arachnoid mater) (ă-rak-noid) n. the middle of the three membranes covering the brain and spinal cord (see meninges), which has a fine, almost cobweb-like, texture. a. villi thin-walled projections of the arachnoid into the blood-filled sinuses of the dura, through which cerebrospinal fluid flows from the subarachnoid space into the bloodstream. Large villi (Pacchionian bodies) are found in the region of the superior sagittal sinus.

arachnoid

views updated May 14 2018

arachnoid Resembling a spider's web (spiders belong to the class Arachnida).

arachnoid

views updated May 23 2018

arachnoid Resembling a spider's web (spiders belong to the class Arachnida).

arachnoid

views updated May 17 2018

arachnoid Resembling a spider's web.

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