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 Saptrior 

 JMnxillary, 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 cms 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. 



