Quain's elements of anatomy . inent side of the ampullae,where they each form a forked swelling, which corresponds with thecrista acustica, in the interior of the dilatation. No nerves have beerfound extending to any other parts of the semicircular canals. Vessels of the labyrinth.—The intervial auditory artery, a branch of thebasilar, accompanies the auditory nerve in the internal auditory meatus, anddivides into branches for the vestibule and cochlea. Those of the vestibule supplythe membranous labyrinth and the endosteum, and small vessels ensheathed byfibrous tissue pass across the cavity
Quain's elements of anatomy . inent side of the ampullae,where they each form a forked swelling, which corresponds with thecrista acustica, in the interior of the dilatation. No nerves have beerfound extending to any other parts of the semicircular canals. Vessels of the labyrinth.—The intervial auditory artery, a branch of thebasilar, accompanies the auditory nerve in the internal auditory meatus, anddivides into branches for the vestibule and cochlea. Those of the vestibule supplythe membranous labyrinth and the endosteum, and small vessels ensheathed byfibrous tissue pass across the cavity containing the perilymph. The blood is chieflycollected into the internal auditory veins which accompany the artery and openinto the inferior petrosal or the transverse sinus, but some is conveyed to theinferior petrosal sinus by fine veins in the aqueductus vestibuli. Structure of the membranous labyrinth.—Three layers canbe distinguished in the membranous walls of the semicircular canals, an G G 2 452 THE EAR. Fig. Fig. 392.—Section of one of the human semicircular canals (Riidinger). Magnified. 1, osseous wall; 2, fibrous bands with included blood-vessels, united at 3 with theperiosteum; 4, memliranous canal with its three layers ; 5, short fibrons bands (withintervening spaces) uniting the membranous canal firmly to the periosteum ; 6, union ofits outermost layer with the periosteum. Fig. 393.
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
