224 LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



etc.), just like the posterior roots of the spinal nerves. The nerves 

 arise from these ganglia. (Compare Figs. 47, 72, 86, 109, 110, 

 113, 114, 115, 125, 127, 128, and 132.) 



8. As to the cerehral source of the acoustic nerve, we may 

 assume that it is situated somewhere in the temporal lohe, that 

 from here it is connected, in some way, with the posterior por- 

 tion of the capsule, and that the acoustic tract passes on in that 

 portion of the fillet which originated in the nucleus of the 

 posterior quadrigeminal hody. On reaching the level of the 

 acoustic nucleus it passes to the opposite of these structures in 

 the strise acusticse. There are two acoustic nuclei, a dorsal, 

 which resemhles a sensorv nucleus, both in situation and 



J 



structure, and a ventral, which has a somewhat similar structure 

 to that of the spinal ganglia. From its relations it may, 

 perhaps, he compared to one of the latter. Through its ventral 

 nucleus, the acoustic nerve is connected with the upper olivary 

 hody. From the latter, fasciculi run to the cerebellum and to 

 the nuclei of the ocular muscles, and probably farther up to 

 more anterior regions of the brain. (Compa're Figs. 47, 65, 85, 

 113, 121, 122, 125, and 126.) 



The trigeminus and the acoustic both receive fibres from 

 the cerebellum. 



9. Nothing is known about the central course of the vagus 

 in the fore-brain. If the often-mentioned region in the posterior 

 portion of the capsule is destroyed, no symptoms appear which 

 can be attributed to the vagus. Disturbance of the sense of taste 

 (glosso-pharyngeal) is present. Reference has been made to 

 the course of the fibres from the fillet to the opposite nuclei of 

 the vagus and glosso-pharyngeal. These nerves also apparently 

 receive a tract from the cerebellum. 



10. The central course of the optic nerve has been 

 explained in all its relations. (Compare Figs. 56, 57, 61, 62, 

 66, and 70.) 



I will again remind you that this nerve arises from the 

 pulvinar thalami, the corpus geniculatum laterale, the tuber 



