EXPLANATION OF FIGURES. 



[ Ml figures are photo micrographs taken at a magnification of 750 diameters, except figure 3, which is 400 diameters, and figure 2.V, which 

 ia 800 diameters. By the reproduction they have been reduced one-tenth.] 



ABBREVIATIONS. 



ar., 

 bin., 



cp., 



cy., 



cy', 

 cy", 

 d'., d"., A'"., d iv . 



ep., 

 esap., 



f., 

 f, 

 f", 

 fb., 



gr, 

 hs., 



ic., 

 ih., 

 ip., 



is., 



1, 



I', 



m., 



mcr., 

 nig., 



mh., 

 mi., 



ml, 

 ms, 



mt., 

 mt', 



areolar tissue. 



basement membrane. 



central corpuscle. 



cylinders or prisms of membrana 

 tectoria cut lengthwise. 



cylinders or prisms of membrana 

 tectoria cut transversely. 



cylinders or prisms cut tangen- 

 tially. 



apices of the four rows of Deiters 

 cells. 



epithelial cells. 



epithelial cells of the future sulcus 

 spiralis. 



clear cytoplasmic fields. 



dark cytoplasmic fields. 



filamentous fields. 



fibrillar bundles or superficial 

 segments of the bodies of outer 

 pillars. 



greater epithelial ridge. 



superficial horseshoe-like elements, 

 the bases of the acoustic hairs. 



intraepithelial connective-tissue. 



apices of the inner hair-cells. 



apices of the inner pillars. 



apices of the inner supporting cells. 



longitudinal lines of the recently 

 formed parts of membrana tec- 

 toria. 



transverse lines of the recently 

 formed parts of membrana tec- 

 toria. 



lesser epithelial ridge. 



superficial mosaic. 



superficial mosaic of crista spiralis. 



superficial mosaic of greater epi- 

 thelial ridge. 



superficial mosaic of Hensen cells. 



mitotic figures. 



superficial mosaic of axial seg- 

 ment of the greater ridge. 



superficial mosaic of lesser ridge. 



striated membrane or apices of 

 inner pillars. 



membrana tectoria. 



recently formed part of membrana 

 tectoria. 



mtcr., 



mtg, 



mtl, 



n, 



nb, 



nd', nd", nd'", 



ner, 



ni, 



nip, 



nisu, 



noh', noh"., noli'"., 



nop, 



ns, 



nsu, 



oh, 



oh', oh", oh'", oh iv 



op, 

 pb, 



per, 

 pr. 



sf, 



sph, 



ssp, 



St., 



suf, 



t, 



tb., 

 tb', 



tb"., 



zd, 

 zp. 



membrana tectoria formed on the 



surface of the crista spiralis. 

 membrana tectoria formed on the 



surface of the greater ridge, 

 membrana tectoria formed on the 



surface of the lesser ridge, 

 nuclei. 



nuclear bands of epithelial cells, 

 nuclei of the three rows of cells 



of Deiters. 

 nerve-fibers. 



nuclei of the inner hair-cells, 

 nuclei of the inner pillars, 

 nuclei of the inner supporting cells, 

 nuclei of the three rows of outer 



hair-cells. 



nuclei of the outer pillars, 

 nuclei of the sensorial cells, 

 nuclei of the supporting cells, 

 outer hair-cells, 

 apices of the four rows of outer 



hair-cells. 



apices of the outer pillars, 

 protoplasmic bands of epithelial 



cells. 



periostea! membrane, 

 prolongations of connective-tissue 



cells, 

 three different successive planes 



of recently formed part of the 



membrana tectoria at surface 



of the lesser epithelial ridge, 

 sensorial fields, 

 attraction sphere, 

 future sulcus spiralis. 

 subepithelial part of teeth of 



Huschke. 



fields of the supporting cells. 

 teeth of Huschke. 

 terminal bars, 

 dense part of the membrana 



tectoria. 

 terminal bars alternately thicker 



and thinner. 



zona dentata of the crista spiralis. 

 zona papillaris of the crista 



spiralis. 



85 



