784 OP THE ORGANS OF THE SENSES, AND THEIR FUNCTIONS. 



an examination of Figs. 277 and 278, the former of which represents a sec- 

 tion through one of the coils of the cochlea, whilst the latter shows in par- 



FIG. 277. 



FIG. 278. 



FIG. 277. Section through one of the coils of the 

 Cochlea. ST, seala tympani ; sv, scala vestibuli; cc, 

 canalis cochleie ; R, membrane of Reissner, consist- 

 ing of a single layer of nucleated flattened cells, ex- 

 tending from just behind the teeth of the lirnbus to 

 the upper part of the ligament of the Cochlea ; Us to 

 Up, lamina spiralis membranacea ; Us, linibus laminae 

 spiralis; ., sulcus spiralis; gs, ganglion spirale seated 

 on nc, the nervus coohlearis, indicated by the black 

 line; Iso, lamina spiralis ossea ; I, membrana tec- 

 toria; b, uiembrana basilaris ; Co, organ of Corti ; 

 Isp, ligamentum spirale; Cc, cells of Claudius; 1, 

 proximal rod of Corti ; 2, distal rod of Corti. 



FIG. 278. Vertical section of the organ of Corti in 

 the Dog, magnified SOO diameters, a-b, homoge- 

 neous layer of the membrana basilaris; u, itsvestib- 

 ular layer, corresponding to the strise of the zona 

 pectinata; v, tympana! layer, with nuclei, granular 

 cell protoplasm, and transverse sections of fibrils of 

 connective tissue; a, labium tympanicum of the 

 crista spiralis; a 1 , continuation of the tympanum 

 periosteum of the lamina spiralis ossea ; c, thickened 

 commencement of the membrana basilaris imme- 

 diately external to the passage of the nerves, h; 

 d, vas spirale; e, bloodvessel;/, nerve fasciculi; </, 

 epithelium of the siileus spiralis interims (not well 

 preserved); i, an internal hair-cell; k, its basal pro- 

 cess; surrounding the latter, above the point of emergence of the nerves, are a few nuclei and :\ finely 

 granular mass into which the nerve-fibres stream (granule-layer) ; I, inner part of the capitular lamina 

 of the internal pillar and hairs of the internal hair-cell; m, capitula of the two pillars joined in- 

 gether, the body of the external pillar has here been cut through its middle; behind it th>' Imdy and 

 base, o, of the next pillar come into view ; n, base with nucleated remains of protoplasm of the in- 

 ternal pillar; p, t/, r, three external hair-cells (only traces of the hairs preserved), the first one alone 

 eonip]. t", of the two others only the heads are seen ; t, basal portion of two other hair-cells; s, Hen- 

 sen's supporting cell ; l-l, lamina reticularis; w, a nerve-fibre passing to the first hair-cell,jo, which can 

 be followed beneath the arch to the point of emergence of the nerves. 



ticular the details of the part known as the organ of Corti. The ultimate 

 branches of the auditory nerve appear also, as in the labyrinth, to termi- 



vol. ix, p. ir,o ; A. V. Winiwartcr, Wien. Akad. Sitz.-ber., Bd. Ixi, Abth. 1 ; and 





A I, -tract in d-ntrull.lat.t, 1*7(1, p. 853; Gottst.-in, Ontnilblatt, 1870, p. H'25, and 1872, 

 p. 385; and Rudinger and Waldcycr, in Strieker's I 



^ . ., . T^ 11 1 1 o 1 L. 1 *7 > ....1 ll. :_ _i*i . f it 



Hum. and Comp. Histology, Syl. 



Soc. Trans., 1S7;5, vol. iii, in which notices of all recent literature upon the subject 

 will be found. 



