504 



EMBRYOLOGY 



Fi^. 283.— Fart of a section through the cochlea of an emhryo Cat 9 cm. long*, after Boettcher. 



Ik, Cartilaginous capsule, in which the cochlear duct describes ascending spiral turns ; dc, ductus 

 cochlearis ; C, organ of Oouti ; Iv, lamina vestibularis ; x, outer wall of the membranous 

 ductus cochlearis with ligamentum spirals ; SV, scala vestibuU ; ST, ST, sca]a tympani ; 

 £r, gelatinous tissue', which still fills the scala vestibuli (sv') in its last turns ; ^', remnant of 

 the gelatinous tissue, which is not yet liquefied ; M, firm connective tissue surrounding the 

 cochlear nerve {nc)', gsp, ganglion spirale; N, nerve which runs to Cobt.'s organ in the 

 future lamina spiralis ossea ; JT, compict connective-tissue layer, which becomes ossified and 

 shares in bounding the bony cochlear 'duct ; F, perichondrium. 



