Quain's elements of anatomy . ermedthe reticular lamina (399, /. r.), which covers this part of the organ ofCorti like a wire net. On either side of the two sets of hair-cells theepithelium, becoming gradually shorter, passes continuously into thesimple layer of cubical cells which is found in the spiral groove and onthe lateral part of the basilar membrane. The whole organ is further covered by a thick, fibrillated membrane—the tectorial msmlrane (fig. 400, )—which is attached at one edgeto the upper surface of the limbus, falls over the crest, and rests on therods of Corti and the hair-
Quain's elements of anatomy . ermedthe reticular lamina (399, /. r.), which covers this part of the organ ofCorti like a wire net. On either side of the two sets of hair-cells theepithelium, becoming gradually shorter, passes continuously into thesimple layer of cubical cells which is found in the spiral groove and onthe lateral part of the basilar membrane. The whole organ is further covered by a thick, fibrillated membrane—the tectorial msmlrane (fig. 400, )—which is attached at one edgeto the upper surface of the limbus, falls over the crest, and rests on therods of Corti and the hair-ceUs, thus converting the spiral groove intoa canal. It will be necessary to describe more minutely these severalparts of the organ of Corti. Rods of Corti.—The inner and outer rods of Corti differ from oneanother in shape, although agreeing, for the most part, as regards thedetails of then- structure. Each inner rod may be best compared inshape to a human idna, the upper end of the rod being pretty accm-ately Fig. Fig. 403.—Profile view op an inner and an outer rod in connection with THREE hair-cells, AND PART OF THE LAMINA RETICULARIS (FROM THE GUINEA- ig). () Vert highly , inner rod ; , outer rod ; \, h„_, h^, hair-cells of first, second, and third rowsrespectively. They appear, especially the second and third, narrow in the middle, thethinedge of the riband-shaped cell being here seen, but below have become accidentally twistedso that the flattened side is brought into view. A nucleus is visible in li^, but none is seen inK, /ij, probably owing to its being contained in the part of the cell the edge of which isturned towards the observer. The lower ends of all three, together with their basilarprocesses, have become broken off fn the preparation of the specimen ; s, one of the suc-ceeding epithelial cells ; c, cuticular thread attached to lamina reticularis, and probablybelonging to a cell of Deiters ; p, phalangeal process of outer rod
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
