OPHTHALMIC NERVE. 489 



the under surface of the ganglion without passing through it and 

 can be traced along with the inferior maxillary nerve to the mus- 

 cles of mastication. 



The three nerves pass off from the convex or anterior side of 

 the ganglion, and are denominated the Ophthalmic, the Superior 

 Maxillary, and the Inferior Maxillary. 



The Ophthalmic Nerve, 



Is a trunk of about three quarters of an inch long; it passes 

 into the orbit of the eye through the foramen lacerum : and it 

 there divides into several branches, which are called, from their 

 distribution, the Frontal or Supra Orbitar, the Nasal and the 

 Lachrymal. 



Fig. 207.* 



* A diagram, showing the fifth pair of nerves with its branches. 1. The 

 origin of the nerve by two roots. 2. The nerve escaping from the crus cere- 

 belli. 3. The Gasserian ganglion. 4. Its ophthalmic division. 5. The frontal 

 nerve, giving off the supra-trochlear branch, and escaping on the forehead 

 through the supra-orbital foramen. 6. The lachrymal nerve. 7. The nasal 

 nerve, passing at 8 through the anterior ethmoidal foramen, and giving off the 

 infra-trochlear branch. 9. The communication of the nasal nerve with the 

 ciliary ganglion. 10. A small portion of the third nerve with which the gang- 

 lion is seen communicating ; the ganglion gives off the ciliary branches from its 

 anterior aspect. 11. The superior maxillary nerve. 12. Its orbital branch. 

 13. The two branches communicating with Meckel's ganglion ; the three 

 branches given off from the lower part of the ganglion are the posterior palatine 

 nerves. 14, 14. The superior dental nerves, posterior, middle, and anterior. 



