176 



THE NERVOUS SYSTEM. 



(j) The roots- of the first nerve (N. hypoglossus] arise from the 

 spinal cord at a point between the first and second vertebrae ; they 

 run transversely outwards to escape between the first and second 

 vertebrae. The dorsal root is extremelv slender. 



(2) The roots of 

 the second nerve (N. 



The nervous system of Kami i.v- 

 i-nli'ida, from the ventral sur- 

 face. (From Icones physiolo- 

 gicae by A. Ecker. PL XXIV, 

 Fig. i.) 



F Facial nerve. 



G Ganglion of pneumogas- 

 tric nerve. 



He Cerebral hemisphere. 



Lc Optic tract. 



top Optic lobe. 



M Boundary between me- 

 dulla oblongata and spi- 

 nal cord. 



3/r-io Spinal nerves. 



MS Connection between fourth 

 spinal nerve and sympa- 

 thetic chain. 



A" Nasal sac. 



A Sciatic nerve. 



No Crural nerve. 



o Eyeball. 



S Trunk of sympathetic. 



Si-io Sympathetic ganglia. 



A'.l/ Kami communicantes of 

 the same. 



Sp Continuation of sympa- 

 thetic into head. 



/ Olfactory nerve. 



II Optic nerve. 



III Motor oculi nerve. 

 / V Trochlear nerve. 



V Trigeuiiual and facial 



nerves. 



Va Ramus ophthalmicus. 

 Vc Ramus maxillaris. 

 Trf Mandibular branch of 



trigeminal. 

 Ve Hyomandibular branch of 



facial. 



Vg Gasserian ganglion. 

 ("4- Upper end of sympathetic 



trunk in connection with 

 inn ganglion. 



VI Abducens nerve. 

 I'll Facial nerve. 

 VIII Auditory nerve. 



X Glossopharyngeal and 



pneumogastric nerves. 

 A" i Ramus anterior of glosso- 



pliaryngeal. 

 A"2 Ramus interior of glosso- 



pharyngeaL 

 .V ; 4 Hralichth ol' J>HL'UI/I. y;i 



trie. 



S7 



