132 



ELEMENTS OF MAMMALIAN ANATOMY. 



The parotid gland is the largest of the salivary group 

 and lies just ventrad to the base of the external ear 

 (Fig. 64) beneath the skin. It is about two centimeters 

 in diameter. Its secretion is poured into the mouth 

 through Stenson's duct, which may be seen extending 

 from the cephalic margin of the gland over the masseter 

 muscle, to near the angle of the mouth, where it per- 

 forates the buccinator muscle, and opens within the 

 mouth on the cheek, opposite the prominent cusp of the 



last premolar. The duct 

 and gland may be injected 

 with Berlin blue by insert- 

 ing the cannula into the 

 orifice of the duct (Fig. 64). 

 The submaxillary gland is 

 near the angle of the man- 

 dible and ventrad to the 

 parotid. Wharton's duct 

 extends from its anterior 

 surface, between the digas- 

 tric and masseter muscles, 

 to its orifice on the floor of 

 the mouth, opposite the last 

 tooth of the mandible. 



The sublingual gland is 



quite small, elongated, and lies cephalad of the submaxil- 

 lary. Its duct extends parallel with that of the submaxil- 

 lary and opens within the mouth upon the same papilla 

 beneath the tongue. The malar gland is very small and 

 lies near the angle of the mouth ventrad of Stenson's duct. 

 Its several ducts, which are not easily demonstrated, pass 

 through the cheek to open within the mouth. The zygo- 

 matic or infraorbital gland lies on the lateral part of the 

 orbit on the ventro-lateral surface of the eyeball. It may 



FIG. 64. LATERAL ASPECT OF THE 

 HEAD WITH THE SKIN REMOVED. 



cr, Carotid artery ; c s, esophagus ; Im, 

 lymphatic gland ; nr, vagus and 

 sympathetic nerves; sm, sub- 

 maxillary gland; tr, trachea; v, 

 cervical vertebra. 



