. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. 302 THE CAT, [chap. ix. A very peculiar organ lies in the floor of the canalis membranacea, which organ is termed the organ of Corti. It lies upon the basilar membrane, and is covered above by a delicate lamina, the membrana tectoria. The latter separates the organ from the cavity of the canalis membranacea with its contained endolymph. Thus this organ, with the basilar membrane below it and the membrana tectoria above it, forms a thickened floor to the relatively wide canal of the ca
. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. 302 THE CAT, [chap. ix. A very peculiar organ lies in the floor of the canalis membranacea, which organ is termed the organ of Corti. It lies upon the basilar membrane, and is covered above by a delicate lamina, the membrana tectoria. The latter separates the organ from the cavity of the canalis membranacea with its contained endolymph. Thus this organ, with the basilar membrane below it and the membrana tectoria above it, forms a thickened floor to the relatively wide canal of the canalis membranacea. The organ itself consists partly of nucleated cells with stiff hair-like processes, partly of epithelial cells, and partly of two rows (one inner and one cuter) of tough rods (compared with cartilage in consistency), so leaning against each other as to enclose beneath them a minute triangular space between them and the basilar membrane. This long double. Fig. 139.—A pair of Rods of Corti in side view, highly magnified. ir. Inner rod. er. Outer rod. The nucleated protoplasmic masses at the feet of the two rods are also shown resting on the basilar membrane. series of rods has been compared to the keys of a piano, which they to a certain extent resemble. Thus it may be said that each fibre of the organ of Corti consists of two filaments joined together so as to form an angle open downwards. Cells bearing hair-like fibres and epithelial cells are'placed on each side of this double range of rods, and beneath the inner cells (between the inner bases of the rods and the basilar membrane) are certain nucleated particles of protoplasm. The membranous semicircular canals occupy about one-third of the space enclosed by the bony canals in which they are suspended, and they dilate into ampullae there where the osseous semicircular canals so dilate. The lining of epithelium exhibits cells, which each sends forth hair-like processes projecting into the endolymph. The aud
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectanatomy, bookyear1881
