168 



FUNCTIONS OF THE NERVOUS SYSTEM. 



Fig. 36. 



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, 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 fierve, 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 separated by an arrow; 

 19, the gustatory nerve ; 20, the chorda tympani joining it at an acute angle ; 21, the sub-maxillary 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. 



[Fig. 37. 



A view of the distribution of the Trifacral or 

 Fifth pair; 1, orbit ;-2, antrum highmorianum ; 3, 

 tongue; 4, lower jaw-bone; 5, root of the fifth 

 pair, forming the ganglion of Gasser; 6, first 

 branch of the fifth pair, or ophthalmic; 7, second 

 branch of the fifth pair, or superior maxillary; 

 8, third branch of the fifth pair, or inferior maxil- 

 lary; 9, frontal branch, dividing into external and 

 internal frontal nerves ; 10, lachrymal branch of 

 the fifth pair; 11, nasal branch; just under the 

 figure is the long root of the lenticular or ciliary 

 ganglion and a few of the ciliary nerves ; 12, 

 internal nasal nerve, disappearing through the 

 anterior ethmoidal foramen; 13, external nasal 

 nerve; 14, external and internal frontal nerve ; 

 15, infra-orbitary nerve ; 16, posterior dental 

 branches; 17, middle dental branch; 18, anterior 

 dental nerve; 19, terminating branches of the 

 infra-orbital nerve, called the labial and palpe- 

 bral nerves; 20, subcutaneous malce, or orbitar 

 branch; 21, pterygoid, or recurrent nerve, from 

 Meckel's ganglion; 22, five anterior branches of 

 the third branch of the fifth pair; 23, lingual 

 branch of the fifth, joined by the chorda tym- 

 pani; 24, inferior dental nerve; 25, its mental 

 branches ; 26, superficial temporal nerve ; 27, 

 auricular branches ; 28, mylo-hyoid branch.] 



