400 



FIFTH PAIR OF NERVES BRANCHES. 



muscles and integument of the cheek, forming a plexus with the 

 facial nerve. 



Fig. 131* 



The Branches of the superior maxillary nerve are divisible into 

 three groups: 1. Those which are given off in the spheno-m axil- 

 lary fossa. 2. Those in the infra-orbital canal ; and 3. Those on 

 the face. They may be thus arranged : 



t' Orbital. 



Spheno-maxillary fossa, < Tw r o from Meckel's ganglion,! 

 ( Posterior dental. 



* 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 cerebelli. 3. Th Cas- 

 serian 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 ganglion 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. 15. The infra- 

 orbital branches distributed upon the cheek. 16. The inferior maxillary nerve. 17. 

 Its anterior or muscular trunk. 18. The posterior trunk; the two divisions are sepa- 

 rated by an arrow. 19. The gustatory nerve. 20. The chorda tympani joining it at 

 an acute angle. 21. The submaxillary ganglion. 22. The inferior dental nerve. 23. 

 Its mylo-hyoidean branch. 24. The auricular nerve, dividing behind the articulation 

 of the lower jaw, to reunite and form a single trunk. 25. Its branch of communication 

 with the facial nerve. 26. Its temporal branch. 



t We now encounter a different mode of describing the nerves from that which has 

 been so long in use; for where it was customary to describe these branches as branches 

 of the fifth pair running down to form Meckel's ganglion, we now find them described 

 as running up to join the fifth pair. This arises from the belief now general that these 

 ganglia form a part of the great sympathetic, and the student will find their description 

 under that head. G. 



