. 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 tlie floor of tlie caualis mcmbranacea, which organ is termed the organ of Corti. It lies upon the basilar membrane, and is covered above by a delicate lamina, the membmna tedoria. 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 tlie merabraua tectoria above it, forms a thickened floor to tiie relatively wide canal of the
. 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 tlie floor of tlie caualis mcmbranacea, which organ is termed the organ of Corti. It lies upon the basilar membrane, and is covered above by a delicate lamina, the membmna tedoria. 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 tlie merabraua tectoria above it, forms a thickened floor to tiie relatively wide canal of the canalis mcmbranacea. The organ itself consists partly of nucleated cells with stiff hair-like processes, partly of epithehal cells, and partly of two rows (one inner and one outer)_ 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. if. Inner rod. cr. Outer rod. Fig. 13'.).—A rAiu OF Rods of Coeti in side view, highly maonified. The iiucloatcd prntojilasinic masses at the loot of tlio two rods are also shown resting on tlie liasilar monihrane. 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 tliis 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 iNiEMBRANous SEMICIRCULAR CANALS occupy about ouc-third of the space enclosed by the bony canals in which they are suspended, and they dilate into ampulla) there where the osseous semicircular canals so dilate. The lining of epithelium exhibits cells, which each sends forth hair-like processes projecting into the endo
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectanatomy, bookyear1881
