296 ANATOMY OF THE RABBIT 



posterolateral part of the upper lip, in common with (c). 



(e) The levator alae nasi. Origin : Ventral part of the maxil- 

 lary fossa. Insertion: Skin covering the lateral cartilage 

 of the nose. The muscle is slender and is inserted by a long 

 tendon which underlies the insertion portions of the two 

 preceding muscles. 



(/) The caninus. Origin: Lateral border of the upper jaw. 

 Insertion: Hairy portion of the mucous membrane of the 

 mouth. The muscle is very broad, short, and thin and is 

 closely applied to the lateral surface of the buccinator. 



(g) The buccinator. A broad stout sheet of fibres enclosing 

 the cheek. Origin: The alveolar borders of the upper jaw 

 and mandible as well as the anterolateral surface of the 

 mandible. The insertion portion curves forward into' each 

 lip to be attached to the lining of the mouth. 



{h) The quadratus labii inferioris. Origin: Ventral border of 

 the mandible. Insertion: Skin of the lower lip. 



(i) The mentalis. The muscle surrounds the anterior portion 

 of the mandible behind the incisor teeth. It is attached 

 externally to the skin of the lower lip through the insertion 

 portion of the quadratus labii inferioris, which largely over- 

 lies it. 



Because of the great size and mobility of the ears, the cutaneous 

 auricular muscles, comprising some twenty different members, are 

 especially well developed. These muscles are not individually described, 

 but their extent should be noted in contrast to the vestigial character 

 of the ear muscles in man. 



Dissection of glands on the lateral aspect of the head (Fig. 107). 

 The salivary glands are extensively developed in the rabbit. The 

 largest is the parotid gland, described above (la). The sub- 

 maxillary gland is described on page 298, the sublingual gland on 

 page 307, and the zygomatic gland on page 316. 



(j) The superior buccal gland, a long, narrow band of loosely 

 connected lobules internal to the more dorsal part of the 

 buccinator muscle, which must be divided to expose the 

 gland. The lobules of the gland are associated with the 

 superior labial artery and extend from a point just above 



