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Brain - LoveToKnow 1911 (17173 words) |
 | Between the dura mater and the subjacent arachnoid membrane is a fine space containing a minute quantity of limpid serum, which moistens the smooth inner surface of the dura and the corresponding smooth outer surface of the arachnoid. |
| At the base of the brain, and opposite the fissures between the convolutions of the cerebrum, the interval between the arachnoid and the pia mater can, however, always be seen, for the arachnoid does not, like the pia mater, clothe the sides of the fissures, but passes directly across between the summits of adjacent convolutions. |
| The cell which conducts impulses to the brain from the olfactory membrane in the nose resembles cells in the skin of the earthworm, in that its cell-body lies actually amid the epithelium of the skin-surface and is not deeply buried near or in the central nervous organ. |
| Arachnoid Cyst - Skull Base Institute (878 words) |
| Arachnoid cysts are congenital benign fluid collections within the arachnoid membrane-one of the 3 membranous layers that cover the brain and the spinal cord. |
| According to their size and location arachnoid cysts may not produce any symptoms and are only discovered incidentally on MRIs of the brain performed for a variety of reasons, or they may enlarge and become symptomatic by exerting pressure on the surrounding brain or by interfering with the dynamics of the CSF circulation. |
| Primary or congenital arachnoid cysts are maldevelopmental anomalies and should be differentiated from secondary arachnoid cysts that are rare and result from a variety of such etiologies as trauma and infection. |
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