758 



PHYSIOLOGY. 



organ of Corti and a central branch to the cochlear nucleus in the 

 medulla. The cochlear nucleus consists of two parts: the accessory 

 nucleus and the tuberculum acusticum. Hence the first neuron ex- 

 tends from the spiral ganglion to the cochlear nucleus; then the 

 two divisions of the cochlear nucleus the accessory nucleus and 



EYE. 



Oc M 



Fig. 314. Connections of Cochlea with Central Nervous System. 



(PATON.) 



Coch.R, Cochlear root of eighth nerve. N.Acc, Tuberculum acusticum and 

 nucleus accessorius sending fibers to the cerebrum (C.B.) and to oculo-motor 

 mechanism (2V.F/.). 



tuberculum acusticum send out neuraxons to the superior olive; 

 here they are second neurons. The superior olive sends out neuraxons 

 to the lateral fillet; here the third neuraxons make up chiefly the 

 lateral-fillet fibers. These go to the posterior corpora quadrigemina 

 and finally are connected with the seat of hearing in the first tem- 

 poral convolution. 



The vestibular root arises in Scarpa's ganglion-cells of the laby- 

 rinth and goes to the vestibular nucleus. 



