| sylvian l. |
a line on the head extending from the external angular process of the frontal bone to a point three fourths of an inch inferior to the most prominent point of the parietal bone. It coincides with the direction of the lateral cerebral sulcus (fissure of Sylvius).
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| sylvian p. |
a point on the surface of the skull from 29 to 32 mm behind the external angular process of the frontal bone.
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| sylvian s. |
impairment of vertical gaze, retraction nystagmus, convergence nystagmus, convergence spasms, and poor or absent reaction of the pupils (which are usually of normal size) to light or near vision. It is caused by a neoplasm, inflammation, or vascular lesion adjacent to the periductal gray matter of the aqueduct of Sylvius. Called also Koerber-Salus-Elschnig s. and retraction nystagmus.
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| sylvian v.’s |
see vena media superficialis cerebri.
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| sylvian artery |
[Fran?ois Sylvius] The middle cerebral artery in the fissure of Sylvius.
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