504 



EMBRYOLOGY 



Fig. 283. Part of a section through the cochlea of an embryo Cat 9 cm. long, after BOETTCHER. 



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

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

 ductus coshlearis with ligamentum spirale ; Sl r , seala vestibuli ; ST, SI", scala tympani ; 

 g, gelatinous tissue, which siill fills the scala vestibuli (sv 1 ) in its last turns ; g", remnant of 

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

 C03hlear nerve (nc) ; gsp, ganglion spirale ; A', nerve which runs to CORTI'S organ in the 

 future lamina spiralis ossea ; Y, compact connective-tissue layer, which becomes ossified and 

 shares in bounding the bony cochlear duct ; P, parichondrium. 



