THE HEAD. 377 



angle of the jaw and some distance forwards along 

 its inner surface. 



The duct of the parotid, or Stenonian duet, 

 leaves the gland at its anterior border, and runs 

 forwards just beneath the skin, parallel to and 

 about a quarter of an inch below the zygomatic 

 arch. It opens into the mouth by a small aper- 

 ture on the inner side of the cheek, opposite the 

 second upper premolar tooth. 



b. The infra-orbital gland is an irregular lobulated 



mass, about three-quarters of an inch long, lying 

 below and in front of the eye, partly above the 

 zygomatic arch and partly hidden by it. 



The duct runs downwards to open into the 

 mouth, close to the Stenonian duct. 



c. The sub-maxillary gland is a compact reddish 



ovoidal mass, lying close to its fellow between 

 the angles of the mandible, and in front of the 

 larynx. 



The duct, Wharton's duct, leaves the outer 

 side of the gland near its hinder end, and runs 

 forwards along the inner side of the jaw to open 

 into the floor of the mouth, midway between the 

 lower incisors and the root of the tongue, the 

 openings of the ducts of the two sides being about 

 an eighth of an inch apart. 



Dissect from the ventral surface. To follow the duct into 

 the mouth, turn the halves of the lower jaw aside. 



d. The sublingual gland is an elongated flattened 



reddish body, about three-quarters of an inch 

 long, lying along the inner side of the ramus 

 of the mandible, between this and Wharton's 

 duct. 



The ducts open separately on the floor of the 

 mouth. 



