. Elementary physiology . Fig. 119.—View of the interior of the left osseous labyrinth. The bony wall of the labj-rinth is removed superiorly and externally. i, fovea hemi-elliptica ; 2, fovea hemlsphasrica ; 3, common opening of the superior and posterior semicircular canals ; 4, open- ing of the aqueduct of the vestibule ; 5, the superior, 6, the posterior, and, 7, the external semicircular canals; 8, spiral tube of the cochlea ; 9, scala tympani ; 10, scala vestibuli. two turns and three-quarters rovmd a slender central pillar of bone, called the modiolus, from which a spirally wound lamina
. Elementary physiology . Fig. 119.—View of the interior of the left osseous labyrinth. The bony wall of the labj-rinth is removed superiorly and externally. i, fovea hemi-elliptica ; 2, fovea hemlsphasrica ; 3, common opening of the superior and posterior semicircular canals ; 4, open- ing of the aqueduct of the vestibule ; 5, the superior, 6, the posterior, and, 7, the external semicircular canals; 8, spiral tube of the cochlea ; 9, scala tympani ; 10, scala vestibuli. two turns and three-quarters rovmd a slender central pillar of bone, called the modiolus, from which a spirally wound lamina projects inwards, dividing the tube partially into two compartments. The membranous labyrinth lies within this spiral cavity, and between the membrane and the bony wall a space exists filled with perilymph. The membranous cochlea is divided into three distinct tubes (see Fig. 120) by two membranes. One of these mem- branes (the basilar membrane) stretches from the spiral lamina of bone mentioned above to the opposite wall of the bony cochlea, thus forming two divisions in the tube, called the scala tympani (beneath) and scala vestibuli (above). The second membrane {Reissner's mcfnbranc) meets the basilar membrane at an angle, and shuts off a small spiral chamber from the scala vestibuli, which is called the canal of the cochlea (see Figs. 120, 121). It is within this canal of the cochlea that the organ of Corti is placed, resting upon the basilar membrane (see Fig. 121). The terminations of the
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Keywords: ., bookcentury1800, bookdecade1890, bookpubli, booksubjectphysiology
