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Arachnoid |
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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.
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 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. 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. arachnoid adjective Like a cobweb, covered with or consisting of entangled soft fibers or hair-like material noun A member of the arachnoid family How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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One spider was attached to the ceiling while two larger arachnoids - one of which guarded marmoreal eggs enclosed in a web - lay in the shadows, ready to spring. |
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