272 



THE CAT. 



[CHAP. ix. 



comes to the surface of the encephalon just ahove the superficial 

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



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



-MN 



Fig. 130. DIAGRAM REPRESENTING THE PRINCIPAL CRANIAL NERVES. 



The orbit is cut open, the zygoma and part 

 of the cranial; wall removed, and the man- 

 dible reflected downwards to show its inner 

 surface. 



MN. Third or nictitating eyelid. 



Sr. Superior rectus muscle. 



Er. External rectus. 



Ir. Inferior rectus. 



Lp. Levator palpebra muscle, cut and pulled 

 upwards. 



gn. Gustatory nerve, going to tongue. 



Ct. Chorda-tympani. 



in.d. Inferior dental. 



mh. Mylo-hyoid. 



Oc. Occipital condyle. 



i. Infra-orbital. 



d. Dental nerve. 



gg. Gasserian ganglion. 



gpv. Ganglion of trunk of pneumogastric. 



si and il. Superior and inferior laryngeal nerves. 



2. Optic nerve. 



3. Third nerve, or ocido-motor. 



5. Trigeminal. 



5a. Ophthalmic, or first division of fifth nerve. 

 5&. Its second division. 

 5c. Its third division. 



6. Sixth nerve, or abducens* 



7. Facial. 



9. Glosso-pharyngeal. 



10. Pneumogastric. 



11. Spinal accessory. 



12. Hypo-glossal. 



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

 by some sympathetic nervous filaments, and then gives off three 

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

 lesser root. 



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

 one notably distinct from the others, is called the OPHTHALMIC 

 NERVE (Fig. 130, 50), which passes through the sphenoidal fissure, 

 and supplies, by its subdivisions, the 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. 



