Arachnoid

arachnoid /arach·noid/ (ah-rak´noid)

1. resembling a spider's web.

2. a delicate membrane interposed between the dura mater and the pia mater, separated from the latter by the subarachnoid space.

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a·rach·noid (-rknoid)

adj.

Resembling a cobweb. Used of the arachnoid membrane covering the brain and spinal cord.

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Arachnoid

One of the membranes that sheathes the spinal cord and brain; the arachnoid is the second-layer membrane.

Mentioned in: Central Nervous System Infections

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arachnoid

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.

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cerebral arachnoid, arachnoidea cerebri

the arachnoid investing the brain.

arachnoid cyst

cysts of the pia and arachnoid containing cerebrospinal fluid; may cause gradually increasing pressure on nervous tissue, especially spinal cord, causing ataxia, paresis.

arachnoid fibroblastoma

see meningioma.

arachnoid granulations

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 membrane

arachnoid; middle layer of the meninges.

spinal arachnoid

the arachnoid investing the spinal cord.