80 



THE ORGAN OF CORTI. 



Fig. 49. — Tympanal wall of the ductus cochlearis, from the dog. Surface view from 

 the side of the scala vestibuli, after the removal of Reissner's membrane, S^Q. I. 

 Zona denticulata Corti. II. Zona pectinata Todd-Bowman : 1, Habenula sulcata 

 Corti ; 2, Habenula denticulata Corti; 3, Habenula perforata Kolliker. III. Organ 

 of Corti : a, portion of tlie lamina spiralis ossea (the epithelium is wanting) ; h and 

 c, periosteal blood-vessels ; d, line of attachment of Keissner's membrane ; e and 

 e^, epithelium of the crista spiralis ;/, auditory teeth, with the interdental furrows ; 

 g, g^, large-celled (swollen) epithelium of the sulcus spiralis internus, over a certain 

 extent shining through the auditory teeth ; from the left side of the preparation 

 they have been removed ; h, smaller epithelial cells near the inner slope of the 

 organ of Corti ; k, openings through which the nerves pass ; i, inner hair cells ; 

 I, inner pillars; hi, their heads; o, outer pillars; n, their heads; p, lamina 

 reticularis ; q, a few mutilated outer hair cells ; r, outer epithelium of the ductus 

 cochlearis (Claudius's cells of the author's) ; removed at s in order to show the 

 points of attachment of the cuter hair cells. After Waldeyer, in Strieker's 

 " .Manual of Histology." 



