294 ANATOMY OF THE RABBIT 



A lymph t;l^i"<^l ^>^ some size is imbedded iii the posterior 

 aspect of the upi)er part of the parotid. 



(b) The chief part of the seventh cranial or facial nerve 

 (n. faciahs) appears in the anterior portion of the parotid 

 gh\nd, its branches crossing the masseter. They are dis- 

 tributed as motor nerves to the cutaneous muscles of the 

 face, including the platysma. 



{c) The masseter muscle. Origin: The zygomatic arch; 

 tendinous from its anterior angle and fleshy behind. In- 

 sertion: Lateral surface of the angle of the mandible. This 

 muscle should not be disturbed at present. It is described 

 in more detail on i)age 302. 



(d) The external maxillary artery (a. maxillaris externa) ap- 

 pears at tlu; ventral border of the mandible immediately 

 in front of the masseter. It i)asses dorsad to the region just 

 in front of the eye, where it ends as the angular artery (a. 

 angularis). Its chief branches to the anterior portion of the 

 face are: (1) the submental artery (a. submentalis) to the 

 chin, a small branch rising near where the external maxillary 

 crosses the ventral margin of the mandible; (2) the in- 

 ferior labial artery (a. labialis inferior) to the lower lip; 

 and (3) the superior labial artery to the upper lip. 



A small vessel, the transverse facial artery, crosses the cheek, 

 running along the ventral border of the zygomatic arch. It is a branch 

 of the superficial temporal (p. 307). 



(e) The anterior facial vein (v. facialis anterior) accompanies 

 the external maxillary artery. It begins in front of the eye 

 as the angular vein, and receives as tributaries the superior 

 and inferior labial veins. 



2. Dissection of the facial muscles. These muscles arise from the 

 facial portion of the skull, and are inserted into the skin about 

 the upper and lower lips. 



(a) The subcutaneus faciei, a thin muscle described as origi- 

 nating on the lateral border of the premaxilla, its frontal 

 process, and the supraorbital process of the frontal bone 

 and as being inserted on the skin of the dorsal surface of 

 the nose, appears to vary in the degree of its development. 



