128 



HEAD AND NECK 



facial branch of the second or maxillary division of the fifth 

 nerve. This small nerve pierces the zygomatic bone a short 

 distance below the lateral border of the orbit. 



The lower filaments are larger. They run anteriorly along 

 the lower border of the zygomatic arch, under cover of the 

 musculus zygomaticus and the infra-orbital part of the 



-~^ ~~~-~~^ 



Supra-orbital 



Zygomatico-temporal 

 Supra-trochlear 

 Lacrimal 



I nfra-trochlear 



External nasal 

 Infra-orbital 



Mental 



Zygomatico- 

 facial 



Auriculo-temporal 



Posterior auricular 



Trunk of facial' 



Branch to posterior 



belly of digastric 



and stylo-hyoid 



Buccinator 



FIG. 59. Nerves of the Face. The facial nerve is depicted in yellow, 

 the sensory branches of the trigeminal in black. 



i. Temporal branches. 4. Buccal branch. 



2 and 3. Zygomatic branches. 5. Mandibular branch. 



6. Cervical branch. 



quadratus labii superioris, and deep to the latter they com- 

 municate with the infra-orbital branch of the maxillary division 

 of the fifth nerve, forming with it the infra-orbital plexus. 



The biiccal branch or branches run towards the angle of 

 the mouth. At the anterior border of the masseter they com- 

 municate, around the anterior facial vein, with the buccinator 

 branch (O.T. .long buccal) of the third division of the fifth, 

 and they supply the buccinator and the orbicularis oris. 



Dissection. In order to trace the branches to their terminations and to 

 display fully the infra-orbital plexus, cut through the musculus zygomaticus 



