504 



EMBRYOLOGY 



ik 



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



A*. < artilaginous capsule, in which the cochlear duct describes ascending spiral turns ; dc, ductus 

 cochlearia; C, organ of COKTI ; la, lamina vestibularis ; x, outer wall of the membranous 

 ductns cochlearis with ligamentum spirale ; Sl r , scala vestibuli ; ST, Sr, scala tympani ; 

 g, 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; tf, nt-ive which runs to CORT .'s organ in the 

 futvire lamina spiral w ossea ; 7, compvct connective-tissue layer, which becomes ossified and 

 hares in bounding the bony cochlear duct ; P, perichondrium. 



