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LABORATORY MANUAL OF HUMAN ANATOMY 



(pab) Cochlear ramus (ramus cochleae). 

 (pac) Arterial glomeruli of cochlea (glomeruli arteriosi 

 cochleae). 



Veins. 



(pb) Internal auditory veins (Vv. auditivae internae). 



Of what are they tributaries? 

 (pba) Spiral vein of modiolus (V. spiralis modioli). 



(pbaa) Prominent vessel (vas prominens). 

 (pbb) Vestibular veins (Vv. vestibulares) . 

 (pbc) Vein of aqueduct of vestibule (V. aquaeductus 



vestibuli). 

 (pbd) Vein of canaliculus of cochlea (V. canaliculus 



cochleae). 



FIG. 197. 



71 



Spiral organ of Corti of the ductus cochlearis in transverse or radial section. 



re, medullated distal processes of bipolar nerve cells in ganglion spirale ; /, foramen nervosum in 

 labium tympanicum giving passage to a bundle of the cochlear nerve fibres ; tb, tympanal covering of 

 lamina basilaris ; vs, vas spirale ; iS, internal supporting cells which on the left side are continuous 

 with the epithelium of the sulcus spiralis ; p, internal pillar with an inner basal cell (5) next to it ; p', 

 external pillar with its external basal cell, b' ; 1,2,3, Deiters' supporting cells with phalangeal processes 

 arriving at the surface of Corti's organ, there attached to the lamina reticularis, r ; II, Hensen's sup- 

 porting cells which diminish in height toward the right side of the figure and are continuous with C, 

 the cells of Claudius ; k, epithelial cells of the so-called " layer of granules " ; i, internal hair cell, the 

 upper end of which is hidden by the " head " of the internal pillar ; i', hairs of internal hair cell ; e, 

 external hair cell ; e', e' , e' , hairs of three external hair cells ; n, ri 1 to n*, various cross-sections of the 

 spiral cord of nerve distribution ; the " tunnel cord '* extends from ri 1 to n- as a radial bundle ; t, tunnel 

 space ; N, Nuel's space. (After G. Retzius. from A. Rauber's text-book, 1898, S. 818, Fig. 743.) 



The student should now make careful drawings of sections 

 made in various directions through macerated temporal bones, 

 labelling correctly the different structures. 



