272 



THE CAT. 



[chap. IX. 



comes to the surface of the enceplialon just above the superficial 

 origin of the hirger root, which at first conceals it. 



At a short distance from its origin the larger root swells out into 



Fig. 130.— Diagram representing the principal Cranial Nerves. 



The orliit is cut open, the zygoma ami part 

 of tlic i-raiiinliwaU removwl, ami tlie iiiaii- 

 dible reflected downwards t" show its inner 

 surface. 



MN. Third or nictitating eyeliil. 



Si: Superior rectus muscle. 



lu: External rectus. 



Jr. Inferior rectus. 



Lp. Levator palpebrre nnisclc, cut and pulled 

 upwards. 



pi>. Gnstatoiy nen-e, going to tongue. 



Vt. C'liorda-tympani. 



iti.d. Inferior dental. 



mil. Mylo-liyoid. 



Of. Occipital condyle. 



i. Infra-orl)ital. 



(1. Dental nerve. 



!/(/. Gasserian ganglion. 



rjpv. Ganglion of trunk of ])nenniogaslric. 



si and il. Superior and infcrinr laryngeal nerves. 



2. Ojitic ner\e. 



3. Third nerve, or ocido-mohr. 

 5. Trigeminal. 



Tja. Ophthalmic, or first division of fifth nerve. 



[lb. Its second division. 



5c. Its third division. 



0. Sixth neiTC, or abduccns, 



7. Facial. 



0. Glosso-pharjTigeal. 



10. I'ncumogastric. 



11. fSjiinal acccsscny. 

 I'J. llypo-glossal. 



what is called the Gasserian ganglion (Fig. 130, gg). It is joined 

 by some sympathetic nervous filaments, and then gives ofi" three 

 large branches, the hindmost of which is joined by the fifth nerve's 

 lesser root. 



The first of tliesc three branches, which is the smallest, and 

 one notably distinct from the others, is called the ornTiiALMic 

 NiviiVE (Fig- l'>0, '^J(t), Avhich passes through the sphenoidal fissure, 

 and supplies, by its subdivisions, tlie eyeball, mucous membrane of 

 the eyelids, lachrymal gland, and the skin of the nose, forehead, 

 and upper eyelid, dividing into its nasal, frontal, and lachrymal 

 branches. 



