arachnoid membrane

Also found in: Thesaurus, Medical, Encyclopedia.
Related to arachnoid membrane: meninges, arachnoid cyst
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.arachnoid membrane - the middle of the 3 meninges
meninges, meninx - a membrane (one of 3) that envelops the brain and spinal cord
leptomeninges - the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
References in periodicals archive ?
3% of cases it results in subdural hematoma, which is associated with direct interaction of the aneurysm with the basal arachnoid membrane.
d) The most distal portion of the optic nerve is lined by the arachnoid and, as intracranial pressure rises, the cerebrospinal fluid spreads along the arachnoid membrane towards the optic nerve sheath.
The meninges comprise three membranous layers: pia dura, arachnoid membrane, and dura mater.
DISCUSSION: Arachnoid cysts are fluid-filled sacs that occur on the arachnoid membrane that covers the brain (Intracranial) and the spinal cord (Spinal).
The arachnoid membrane across the sylvian fissure could clearly be seen in the proximal fissure, but distally, over the aneurysm, it was obliterated by the thick thrombus surrounding the fundus of a large bi-lobed aneurysm at the middle cerebral artery (MCA) bifurcation.