l62 ANATOMY OF THE SALIVARY GLANDS IN THE CARNIVORA 



a ridge in the ectal wall of the alveobuccal sulcus upon which the 

 orifices of the glands, often slightly pigmented, open in two irregular 

 rows. 



The cavum oris proprius presents on either side of the tongue, be- 

 tween it and the alveolar processes, the alveolingual regions or gutters. 

 Caudad they are widely separated and terminate against the internal 

 pterygoid muscle and the arcus palatinus (Fig. 2, j2, 4g). Craniad 

 they are separated very imperfectly by the frenulum. Tliis has a 

 crescentic form, its deeply concave free border is opposite the diastema, 

 a dorsal cornu is prolonged along the venter of the tongue, a ventral 

 cornu along the floor of the mouth to the symphysis. This portion 

 does not appear when the parts are relaxed, but a faint median furrow 

 separates the phcEe sublinguals. These are minute triangular folds 

 which rest against the shehing surface of the symphysis. Their short- 

 est border is nearly transverse and presents the orifices of the sub- 

 maxillary gland mesad, of the sublingualis major laterad. The 

 border of intermediate length is attached to the frenulum, traction on 

 which lifts the phcK from the symphysis to the distance of about i 

 millimeter. 



The ducts of these glands which are in close contact, appear through 

 the mucosa as a white line parallel to the mandible as far caudad as 

 the lingual nerve. Here they are obscured by the bodies of the lesser 

 sublinguals, the orifices of which are \'isible both in front and behind 

 the nerve and in the ventral portion of the arcus palatinus. The dorsal 

 portion of the arcus, together with the hard palate, is studied with 

 minute orifices, easily recognized by their pigmentation, which belong 

 to the isthmian and palatine glands. 



The parotid gland (Fig. 3, /), irregularly triangular in shape, occupies 

 the angle between the posterior auricular (^S) and superficial temporal 

 veins (37). Its dorsal border, which is concave, corresponds to the 

 cartilage of the external auditory meatus. Not infrequently there is 

 a deep notch in this border. The angles are prolonged in front and 

 behind the meatus into a premeatal and a rudimentary postmeatal 

 process, which are variable within moderate limits. The ventral 

 angle is regularly prolonged beyond the superficial temporal vein. 

 It is of looser structure than the rest of the gland and often manifests 

 a tendency to resolve itself into more or less independent lobules. 



