THE CEREBRAL NERVES 



,'N. vestib.'- 



359 



itB 4 "»'". 7 mm. . %:m 



Pars. inf. 



Pars. sup. 



^'*wi^'- - 



-■■ N. vestib. 



-Pars. sup. 



-■Pars. inf. 



Pars. sup. 



g mm. 



R. amp. sup.\ 



R. amp. lat. 

 R. utric,-- 

 R. sacc. 



'^N. each. 



■ Gang, spirale 



-— N. coch. 

 ~- N. vestib- 



- 1 ',: 



,Pars. inf. 



jR. amp. sup. 



■R. amp. lat. 

 R. utric. 



wmi\ 



"^iKs-.vW" spirale 



R. amp. sup. 



R. amp. lat. 



■pirale 



N. coch. 

 N. vestib. 



30 mm. 





R. amp. sup. 

 %r'R. amp. lat. 



Median View Lateral View 



Fig. 362. — The development of the acoustic gangha and nerves. The vestibular ganglion is iinely 

 stippled, the spiral ganglion coarsely stippled (Streeter). 



Spiral ganglion, the peripheral fibers of which innervate the hair cells of the spiral 

 organ (of Corti) in the cochlea. The spiral ganglion appears in 9 mm. embryos 

 and conforms to the spiral turns of the cochlea, hence its name. Its central nerve 



