| sylvian | Relating to Franciscus or Jacobus Sylvius or to any of the structures described by either of them. (05 Mar 2000) |
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| sylvian angle | The angle formed by the sylvian line and a line perpendicular to the horizontal plane tangential to the highest point of the hemisphere. (05 Mar 2000) |
| sylvian aqueduct | Aqueduct of vestibule, a bony canal running from the vestibule and opening on the posterior surface of the petrous portion of the temporal bone, giving passage to the endolymphatic duct and a small vein. Synonym: aqueductus cotunnii, aqueductus vestibuli, Cotunnius' aqueduct, Cotunnius' canal, cerebral aqueduct. (05 Mar 2000) |
| Sylvian cistern | The subarachnoid space associated with the lateral cerebral sulcus (Sylvian fissure); contains the M1 segment of the middle cerebral artery and the origin of lenticulostriate arteries, and proximal parts of the middle cerebral artery. (05 Mar 2000) |
| sylvian fissure | The deepest and most prominent of the cortical fissures, extending from the anterior perforated substance first laterally at the deep incisure between the frontal and temporal lobes, then back and slightly upward over the lateral aspect of the cerebral hemisphere, with the superior temporal gyrus as its lower bank, the insula forming its greatly expanded floor. Two short side branches, the ramus anterior and ramus ascendens, divide the inferior frontal gyrus into an orbital part, triangular part, and opercular part. Synonym: sulcus lateralis cerebri, fissura cerebri lateralis, lateral cerebral fissure, sylvian fissure, fissure of Sylvius. (05 Mar 2000) |
| sylvian line | The line of the posterior limb of the lateral sulcus (sylvian fissure) of the cerebral cortex. (05 Mar 2000) |
| sylvian point | The nearest point on the skull to the lateral (sylvian) fissure, about 30 mm behind the zygomatic process of the frontal bone. (05 Mar 2000) |
| sylvian valve | An endocardial fold extending from the anterior inferior margin of the inferior vena cava to the anterior part of the limbus fossa ovalis. Synonym: valvula venae cavae inferioris, caval valve, eustachian valve, sylvian valve. (05 Mar 2000) |
| sylvian ventricle | A slitlike, fluid-filled space of variable width between the left and right transparent septum, which occurs in less than 10% of human brains and may communicate with the third ventricle. Synonym: cavum septi pellucidi, Duncan's ventricle, fifth ventricle, pseudocele, pseudoventricle, sylvian ventricle, ventricle of Sylvius, ventriculus quintus, Vieussens' ventricle, Wenzel's ventricle. (05 Mar 2000) |
| sylvian f. |
sulcus lateralis cerebri.
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