MEMBRAXA PROPRIA OF THE DUCTITS COCHLEARIS. 147 

 Fig. 324. 



Fig. 324. Tympanal wall of the ductus cochlearis of the Dog. 

 Surface view from the vestibular scala, after removal of the membrane 

 of Reissner, magnified 300 diameters. J, Zona denticulata of Corti. IT, 

 Zona pectinata of Todd and Bowman ; 1, Habenula sulcata of Corti ; 

 2, Habenula denticulata of Corti ; 3, Habenula perforata of Kolliker. 

 Ill, Organ of Corti ; a, part of the lamina spiralis ossea, destitute 

 of epithelium ; 6 and c, periosteal bloodvessels ; d, line of attach- 

 ment of the membrane of Reissner ; e and ei, epithelium of the 

 crista spiralis ; /, auditory teeth with the interdental furrows ; g, g\, 

 large-celled (swollen) epithelium of the sulcus spiralis internus, partly 

 glimmering through the auditory teeth, removed in the left half of 

 the preparation ; k, smaller epithelial cells in the neighbourhood of 

 the inner slope of the roof of the organ of Corti ; fc, foramina for 

 the nerves ; i, internal hair cells ; I, internal pillars ; m, their capi- 

 tate extremities ; o, external pillars ; n, their capitate extremities ; 



L 2 



