The anatomist's vade mecum : a system of human anatomy . ixth nerve; and, in itsexternal wall, the third, fourth, and ophthalmic nerves. Thesestructures are separated from the blood flowing through the sinus, bythe tubular lining membrane. The cerebral veins from the undersurface of the anterior lobes open into the cavernous sinuses. Theycommunicate by means of the ophthalmic with the facial veins, bythe circular sinus with each other, and by the superior petrosal withthe lateral sinuses. The Inferior jjetrosal sinuses are the continuations of the cavernoussinuses backwards along the lower bor
The anatomist's vade mecum : a system of human anatomy . ixth nerve; and, in itsexternal wall, the third, fourth, and ophthalmic nerves. Thesestructures are separated from the blood flowing through the sinus, bythe tubular lining membrane. The cerebral veins from the undersurface of the anterior lobes open into the cavernous sinuses. Theycommunicate by means of the ophthalmic with the facial veins, bythe circular sinus with each other, and by the superior petrosal withthe lateral sinuses. The Inferior jjetrosal sinuses are the continuations of the cavernoussinuses backwards along the lower border of the petrous portion of thetemporal bone at each side of the base of the skull, to the foraminalacera posteriora, where they terminate with the lateral sinuses in thecommencement of the internal jugular veins. 370 TEANSVERSE SINUS. The Circular sinus (sinus of Ridley) is situated in the sella turcica,surrounding the pituitary gland, and communicating on each sidewith the cavernous sinus. The posterior segment is larger than theanterior. Fig. The Superior petrosal sinuses pass obliquely backwaids along theattached border of the tentorium, on the upper margin of the petrousportion of the temporal bone, and establish a communication betweenthe cavernous and lateral sinus at each side. They receive one or twocerebral veins from the inferior part of the middle lobes, and a cere-bellar vein from the anterior border of the cerebellum. Near the ex-tremity of the petrous bone these sinuses cross the oval aperturewhich transmits the fifth nerve. The Transverse sinus (basilar, anterior occipital) passes transverselyacross the basilar process of the occipital bone, forming a communica-tion between the two inferior petrosal sinuses. Sometimes there aretwo sinuses in this situation. * The sinuses of the base of the skull. 1. The ophthalmic veins. 2. Thecavernous sinus of one side. 3. The circular sinus; the figure occupies theposition of the pituitary gland in the sella turcica.
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
