394 SPECIAL ANATOMY. 



parotid, and divides into three, rarely two, diverging branches, 

 which form a large plexus (plexus parotideus s. anserinus) which 

 surrounds the art. temporalis with a posterior loop. From this 

 pass into the face : 



1. Nn. zygomatici, five branches. The three first (also tern- 

 porales) arise close under the auricle, ascend above the zygo- 

 matic process, give branches to the auricle, to the temple, 

 mm.frontalis and orbicular is, at the outer angle of the orbit, 

 and unite with one another, with subcutan. malce and tempo- 

 ral, superficialis. The fourth, frequently a branch of the 

 third, is situated more deeply, ramifying below in the m. 

 orbicularis. The fifth is larger, sends a superior branch to 

 the inferior eyelid to the n. infraorbitalis ; an inferior to 

 the art. auricular, inferior and filaments to the fat below the 

 malar bone. 



2. Nn. faciales s. buccales, four branches, passing over m. 

 masseter forwards, supplying the ductus Stenonian., the 

 vessels and muscles of the face, of the inferior part of the 

 forehead, of the nose, of the lower eyelid downwards as 

 far as risorius Santorini. They anastomose with n. infra- 

 orbitalis and its plexus. 



3. JV". marginalis maxillce inferioris s. labio-mentalis, descends 

 to the angle of the lower jaw, bends forwards and passes 

 over the horizontal ramus of the lower jaw with a superior 

 branch for the upper portion of the lower lip, with an infe- 

 rior branch to the chin joining the plexus mentalis of n. 

 mentalis (see trigemin.) 



4. Nervi ad plexum platysmamyoideum, generally three 

 branches, descend on the vertical ramus of the lower jaw 

 to the m. platysmamyoides anastomosing with the last 

 nerve and the third cervical ; they reach to the region of 

 the larynx. 



640. VIII. Nervus acusticus, the nerve of Hearing, 

 formerly portio mollis paris VII., arises: 1. In the rhomboidal 

 fossa, behind n. facialis, from corp. restiforme ; 2. From crus 

 cerebelli superius, around which it bends ; coming forth behind 

 the pons and passing on the outer side of n. facialis, which it 

 receives in a groove, outwards and upwards to the internal audi- 

 tory meatus. Here it unites by means of filaments with the n. 

 facialis ; and divides into an anterior (n. cochlea) and a posterior 

 (n. vestibuli) principal branch which pass through the foramina 

 in the base of the auditory meatus to the labyrinth. 



