714 



THE NEBYES. 



ficent expansion, whicli may be looked upon as one of the richest nervous 

 apparatus in the animal economy. Covered at its emergence from the infra- 

 orbital foramen by the supermaxillo-labialis muscle, this fasciculus descends 

 beneath the supernasalis-labialis and pyramidal muscle of the nose (super- 

 maxillo-nasalis magnus) towards the nostrils and upper lip, which receive 

 the terminal extremities of its constituent branches in the substance of their 

 muscular and tegumentary tissues ; these branches are slightly divergent and 

 flexuous, and for the most part anastomose with a large motor trunk furnished 

 by the facial nerve (Figs. 336, 15'). 



C. Infeeior Maxillaey Neeve (Figs. 336, 11 ; 110, 12).— At its exit from 



Fig. 3a6. 





r mpi' 



GENERAL VIEW OF THE SDPEEIOE AND INFERIOE MAXILLARY NERVES. 



The eye has been excised, after sawing through and removing the orbital and 

 zygomatic processes. The maxillary sinuses have been exposed by means of a 

 gouge or chisel, the masseter muscle removed, and the inferior maxilla opened to 

 show the nerve in its interosseous coui-se. 



1, Facial msrve ; 2, Origin of the posterior auricular nerve ; 3, Filament distributed 

 to the stylo-hyoid muscle ; 4, Digastric branch ; 5, Trunk of the anterior auricular 

 nerve ; 6, Origin of the cervical filament ; 7, Plexus formed by the union of the 

 fiicial and superficial temporal nerve ; 7', Branch of that plexus united to the 

 infra-orbital nerves, 15'; 11, Inferior maxillary nerve; 8, Superficial temporal 

 nerve ; 9, Masseteric nerve ; 10, Gustatory nerve ; 12, 12, Dental branches ; 13, 

 Mylo-hyoid nerve ; 14, Buccal nerve ; 15, Superior maxllhry nerve ; 16, Spheno- 

 palatine ganglion; 17, Staphylin (or palatine) nerve; 18, Common carotid 

 artery; 19, Trunk of the occipital; 20, Trunk of the internal carotid; 21, 

 External carotid ; 22, Trunk of the posterior auricular artery embraced by a 

 loop of the facial ; 23, Trunk of the superficial temporal ; 24, Internal -maxillary 

 artery; 25, Trunk of the deep anterior temporal artery; 26, Orbital branch of 

 the superior dental ; 27, Buccal artery ; 28, Inferior dental artery. 



the cranium, this branch is situated immediately within the temporo- 

 maxillary articulation, and from thence is directed forward and downward, 

 passing at first between the two pterygoid muscles, then between the inner 

 and deep face of the maxilla, arriving at the maxillo-dental foramen, through 

 which it passes and runs along the whole course of the canal, escaping at 

 last by the mental foramen to form an expansion of terminal branches 



