An American text-book of physiology . nom labijrinth, in which are found the essential structures of theorgan of hearing (PI. 2, Fig. 4 ; Fig. 278). The membranous labyrinth is filledwith a somewhat watery, mucin-holding fluid, the endolymph, while a similarfluid, the perilymph, is found outside it and within the osseous labyrinth. Theperilymph space, which is lined by lymphafic epithelium, is in communication,along the sheath of the auditory nerve, with the subdural and subarachnoidlymph-areas of the brain. Numerous sheets and bars of connective tissue crossfrom the wall of the bony to that o
An American text-book of physiology . nom labijrinth, in which are found the essential structures of theorgan of hearing (PI. 2, Fig. 4 ; Fig. 278). The membranous labyrinth is filledwith a somewhat watery, mucin-holding fluid, the endolymph, while a similarfluid, the perilymph, is found outside it and within the osseous labyrinth. Theperilymph space, which is lined by lymphafic epithelium, is in communication,along the sheath of the auditory nerve, with the subdural and subarachnoidlymph-areas of the brain. Numerous sheets and bars of connective tissue crossfrom the wall of the bony to that of the membranous labyrinth and help supportthe latter. That part of the membranous labyrinth lying within the vestibuleis composed of two separate sacs—a larger posterior, known as the utricle orutrimlus, and a smaller, more anterior, known as the saccule or sacculus. Theplane of division between the two sacs ends opposite the fenestra ovalis (PI. 2,Fig. 4). Though the sacs are quite separate, their cavities are indirectly continu-. — 9 Fig >78 -Diagram of right membranous labyrinth seen from the external side (after Testut): 1, utri-cle -23 4 superior, posterior, and horizontal semicircular canals; 5, saccule; 6, ductus , 7, its twigs of origin; 8, saccus endolymphaticus ; 9, caualis cochlearis, with 9, its vestibularcul-de-sac, and 9, its blind extremity; 10, canalis reuniens. ous, through the union of two small tubes arising from either sac, which tubesunite to form the ductus endolijmphaficus, a tube running inward through acanal in the petrosal bone and ending blindly in a dilated flattened extremity,the saccus endolymphaticus, this being supported between the layers of thedura mater within the cavity of the skull (PI. 2, Fig. 4). Bundles of audi-tory-nerve fibres penetrate the wall of each sac. The utricle gives rise to themembranous semicircular canals, which communicate with it at five points,it being remembered that the anterior and posteri
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