mi OBG 503 



onic cell- i In- Mix. ; 



fi.^in- plate u liirli .mi tli- lamina -p 



ossea. Thinlly, it elotln-> uitli ;i thin layer tli- . j.it ln-lial .1 



for tin- (list i-iluii inn of til-- Mood-vessels on the latter. 

 in -i- \\ it li ochlearis. 



Fourthly, it line, th.- iiiin-r Mi: In- cart ilagiuoUS Capfltlle &8 



j. richondrimii /' finally, tifthh nied a c< 



6 plate <}') extending hetwcrn tin- - \\hich, 



U p:v\iou-ly de-M-rihed, project > inuanl fr..m tli- iM|.>ul- an i 

 (iiiMvtixv tissue UDBOf t In 

 ami >-j-:M-:it> t lit- tin- in MI. 



so that the latter now oomee to lie in a large oanal, the \\alli-t' win'.-h 



i> in part cartilaginous in part m 

 t'oun<latio:i of tin- lony cochl.-a. 



'I'liat portion of tin- in- s nclivnn' uhi.-h iledinto 



lilmms )nnf:-ti\- tissue beoomes gelatinou ti^- I- 



form- 1- twees tin- pail- just m.-nt ioiir.l t\v.. >p 10 of 



which i> loraH'.l al.ov.- ami tin- otlirr In-low the in ml.i- 

 cochleai'is and tin- inciuhranoiis lamina >piralis. Th*- here- 



fore oi-i-njiy the place of tin- >cala Ve 



tympani (>'/'. Tin- latter ai i- . eV8D l f : t he j r d 

 t ion Ite^inv. in exactly t!:.- -m I aces 



in the oaS6 of the x-micirciilar canals and tin- \ .-.-'. ihule. I:, 

 relatinou^ ti ne the matrix i- .mes softer and more lluid. and 

 tin- cell- liiirin to nndei-^o fat ty de^ein rat ion. Small fluid 

 cavities make their app -o become joined to one ano- 



and finally the whole space occupied hy ^-latinons tissue is till* d 

 with ]ierilymj>h. The process of >t fen ing begins at the base of the 

 cochlea in the region of tin- lir>t >piral ( >7' I advances 



>I.)\\ly touartl tin- cupola. 1 I re \ e>t ilmla i :> scalac finally 



unite, after tin- la-r remnant of the gelatin- has been dis- 



solved. Figure 283 exhihiu a M.ig.- in which, at the base of the 

 cochlea, the peri Km ph. i l>een formed, 



and only .-mail remi.ant- <f tin- gelatin- (</) are pn-- 



wherea- at the a|>c\ of the cochlc! ,11 of 



the gelatinous tittV n place. 



With the development of t 



coi-hleaii- changes form. Win cross sect formerly 



oval, it now assumes the form of those port: 



of the wall which are adjacent to ihular ami tympanic scalae, 



and which have he.-n named from tin me tlat toned. 



