Slowell.] 14: I^Nov. 5, 



alis) ; a ramuscle is inflected around the angle of the mouth and anasto- 

 moses with the buccal branch of the mandibular division of the trigeminus ; 

 it reaches the following muscles : the buccinator, the orbicular, the 2;ygo- 

 matic, the risorius and the depressor anguli oris ; it continues mesad along 

 the dorsal lip between the superior coronary artery and the vein just 

 dorsad, and at the lateral border of the arteriale rete, just dorsad of the 

 canine tooth, the infra-orbital and the buccal nerves anastomose and form 

 a plexitorm swelling for 3-5 mm.; from this united nerve fibres diverge to 

 the levator muscles and to the muscles upon the nasal cartilage. 



N. temporo-facialis. — This is the dorsal division of the cephalic trunk 

 as it crosses the post-auricular artery ;" it is considerably larger than the 

 cervical division (N. cervico-fiicialis); it lies ectad of the external carotid 

 artery, entad of the ventral lobe of the parotid gland and the adjacent 

 lymphatic gland, and upon the ectal surface of the masseter muscle. 

 Entad of the parotid gland, and 10 mm. peripherad of origin, it divides 

 into three rami — the ventral, or infra-orbital ; the middle, or malar ; and 

 the dorsal, or temporal (the malar and the temporal often remain in a 

 common sheath for 10-12 mm., forming the temporo-malar trunk). 



N. infra-orbitalis. — This, the ventral division of the temporo-facial 

 nerve, emerges from the cephalic border of the parotid gland just dorsad 

 of Stenon's duct ; its course is arched toward the angle of the mouth, 

 about midway between Stenon's duct and the zygoma, and lies upon the 

 ectal surface of the masseter muscle ; it sustains anastomotic relations 

 with the malar nerve and the temporo-auricular division of the trigeminus 

 nerve. At the ventral border of the zygomatic muscle it gives anasto- 

 motic filaments to the cervico- facial nerve, as described ; it lies ectad of 

 the zygomatic muscles and dorsad of the superior coronary artery. At the 

 angle of the mouth it gives filaments to the dorsal part of the orbicular 

 muscle ; in its course along the dorsal lip it supplies the levator muscles, 

 the muscle at the base of the vibrissse and the muscles which move the 

 nasal carj;ilage ; it joins the buccal nerve to form the plexiform enlarge- 

 ment in the rete arteriale dorsad of the canine tooth, as already described 

 (v. N. buccalis). 



N. malaris. — This is the middle and large division of the temporo-facial 

 nerve ; the central portion is covered by the parotid gland ; entad of the 

 gland it communicates freely with the temporo-auricular nerve. At the 

 dorsal border of the gland it is apposed to the cephalic temporal artery, 

 and continues along with the artery just caudad of the supra-orbital ridge 

 (the tension of the muscle will dispose the nerve cephalad or caudad of 

 the artery). The principal divisions of the nerve make a dense plexus 

 upon the ectal surface caudad of the supnt-orbital ridge ; the terminal 

 filaments are given to the occipito-frontal muscle over the frontal region 

 where they anastomose with filaments of the supraorbital nerve. At the 

 lateral angle of the eye, where a fascicle joins the supra-orbital, a slender 

 nerve is given off to the zygomatic muscles. The nerve trunk may be 



