Quain's elements of anatomy . also underthe gradually decreasing columnar epithelium of the spiral groove, is alayer of protoplasmic cells with large round nuclei, amongst which finenerve-fibres are said to run in a radial direction. Around the top of eachinner hair-cell is a sort of ring of cuticular substance, which is connectedwith slight projections on the flattened heads of the inner rods, andappears to represent the reticular lamina in tliis 2:)lace. The outer Jmir-cclls are peculiar in shape. They are cylindrical atthe upper end, where they fit into the rings of the reticular lamina and
Quain's elements of anatomy . also underthe gradually decreasing columnar epithelium of the spiral groove, is alayer of protoplasmic cells with large round nuclei, amongst which finenerve-fibres are said to run in a radial direction. Around the top of eachinner hair-cell is a sort of ring of cuticular substance, which is connectedwith slight projections on the flattened heads of the inner rods, andappears to represent the reticular lamina in tliis 2:)lace. The outer Jmir-cclls are peculiar in shape. They are cylindrical atthe upper end, where they fit into the rings of the reticular lamina and * According to Waldeyer there are altogether in the human cochlea about 6000 of theinner rods and 4500 of the outer ones. 464 THE EAR bear the haiiiets, but lower down they are flattened from within out, sothat, in profile, they look narrow, but broader when seen on the flat(fig. 403). These ceUs end below with a rounded extremity (fig. 404, i)slightly bulged to one side, whilst from the other side a thin cuticular Fig. Fig. 404.—Four outer hair-cells in connection with their BASILAR processes. FrOJI THE GUINEA-PIG. HiGHLY MAG-NIFIED. () The cells belong to the same series and are Tiewed flat, h,one or two hairlets which have remained attached ; b, bulgedlower end of cell; j5) basilar process, protoi^lasmic above butbecoming cuticular below and slightly expanded at the extremity/, which is broken away from the basilar membrane. process (p) is prolonged which is fixed to the basilarmembrane (basilar process). Beneath the hair-cellsand resting by a broad base upon the basilar mem-brane, certain other cells are found which are knownas the cells of Deiters (fig. 401, z). These extendupwards for a certain distance between the lowerends of the hair-cells, and each one is then prolongedtowards the surface by a fine cuticular process, which is attached above to one of the so-called phalanges of the reticular lamina, and is known as the phalangeal process. Hensen describe
Size: 1081px × 2312px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
