DISSECTION OF THE DOG 



157 



Irregularly triangular - in outline, with a base notched and embracing the 

 auricle and an apex overlying the submaxillary gland, it is lodged in a depression 

 bounded by the base of the external ear, the masseter muscle, and the wing 

 of the atlas. The lateral surface of the gland is covered by the cutaneous and 

 inferior auricular muscles ; while its deep or medial surface covers the facial 

 nerve, the internal maxillary vein, the base of the external ear, part of the 

 digastric muscle, and part of the submaxillary gland. The great auricular 

 vein runs along its aboral border. 



n. auriculo-palpebralis. 

 Ramus zygomaticus 



m. zygomatics 



n. lacrimalis ^ 



\ 



it. frontalis x ' 



m. orbicularis oculi v 



7*. zygomaticus N y 



n. luccalis dorsalis < J , j 



v. auricularis posterior 



Glandula parotis 

 _. m. masseter 

 ^Glandula submaxillaris 



v. maxiHaris interna 

 v. fugularis externa 



u. et v. facialis' [ ,' 

 Ductus parotideus' t 

 . buccalis ventralis 



Lympho-glandulce' 



v. maxiUaris externa f 



Ramus colli 



Fig. 56. — Superficial dissection of the face. 



Commencing at the oral border and close to the apex of the gland, and 

 formed by the union of a number of smaller ducts, the parotid duct (ductus 

 parotideus [Stenonis] ) crosses the surface of the masseter muscle, pierces the 

 cheek, and opens into the mouth on a level with the third maxillary premolar 

 tooth. 



The nerves of the face are derived from two sources : namely, the fifth and 

 the seventh cerebral nerves. 



Neevus facialis. — The facial, or seventh cerebral nerve acquires a supers 

 ficial position by emerging between the border of the mandible and the parotid 



