566 



NERVOUS SYSTEM. 



to which certain of its filaments are distributed, and its terminal filaments 

 go to the conjunctiva and to the integument of the upper eyelid. 



The frontal branch, the largest of the three, divides into the supratroch- 

 lear and supraorbital nerves. The supratroachlear passes out of the orbit 



between the supraorbital 

 foramen and the pulley of 

 the superior oblique mus- 

 cle. It sends in its course 

 a long, delicate filament to 

 the nasal branch and is 

 finally lost in the integu- 

 ment of the forehead. 

 The supraorbital passes 

 through the supraorbital 

 foramen, sends a few fila- 

 ments to the upper eye- 

 lid, and supplies the fore- 

 head, the anterior and the 

 median portions of the 



FIG. 211. Superior maxillary division of the fifth (Hirschfeld). , , , 



1, ganglion of Gasser ; 2, lachrymal branch of the ophthalmic di- SCalp, the H1UCOUS mem- 

 vision ; 3, superior maxillary division of the fifth; 4, orbital V ir j )T1 p n f +V, P fTvvntal sinna 

 branch ; 5, lachrymo-palpebral filament ; 6, malar branch : 7, Drdn 



temporal branch ; 8, spheno- palatine ganglion; 9, Vidian Q nrl fVio -rorir>raninm 



nerve ; 10, great superficial petrosal nerve ; 11, facial nerve ; d 



12. branch of the Vidian nerve ; 13, anterior and two posterior orinrr tVio frrmtal anrl navi 



dental branches ; 14, branch to the mucous membrane of the m & tj 



alveolar processes ; 15, terminal branches of the superior max- afol Vnnoa 

 illary division ; 16, branch of the facial. 



The nasal branch, 



fore it penetrates the orbit, gives off a long, delicate filament to the ophthal- 

 mic ganglion. It then gives off the long ciliary nerves, which pass to the 

 ciliary muscle and iris. Its trunk finally divides into the external nasal, or 

 infratrochlearis, and the internal nasal, or ethmoidal. The infratrochlearis 

 is distributed to the integument of the forehead and nose, to the internal 

 surface of the lower eyelid, the lachrymal sac and the caruncula. The inter- 

 nal nasal is distributed to the mucous membrane and also in part to the in- 

 tegument of the nose. 



The superior maxillary branch of the fifth passes out of the cranial cav- 

 ity by the foramen rotundum, traverses the infraorbital canal, and emerges 

 upon the face by the infraorbital foramen. Branches from this nerve are 

 given off in a spheno-maxillary fossa and the infraorbital canal, before it 

 emerges upon the face. In the spheno-maxillary fossa, the first branch is 

 the orbital, which passes into the orbit, giving off one branch, the temporal, 

 which passes through the temporal fossa by a foramen in the malar bone and 

 is distributed to the integument on the temple and the side of the forehead. 

 Another branch, the malar, which likewise emerges by a foramen in the 

 malar bone, is distributed to the integument over this bone. In the spheno- 

 maxillary fossa, are also given off two branches, which pass to the spheno- 

 palatine, or Meckel's ganglion. From this portion of the nerve, branches 

 are given off, the two posterior dental nerves, which are distributed to the 



