io8 SURGICAL APPLIED ANATOMY. [Chap.vn. 



Tumours of the parotid are very apt to contain 

 cartilaginous tissue. It is well known that metas- 

 tases after mumps are quite common in the testis. 

 It is significant in this connection that the testis is 

 one of the few parts of the body, apart from bone, 

 where cartilaginous matter forms a frequent con- 

 stituent of the neoplasms of the part. Mr. Paget has 

 pointed out that inflammation of the parotid is 

 peculiarly frequent after injuries and diseases of the 

 abdomen and pelvis. It occurs also very often as a 

 sequela of some specific fevers, but more especially 

 after typhoid. The anatomical or physiological basis 

 of this connection has not been made out. 



Many lymphatic glands are placed upon the 

 surface and in the substance of the parotid gland. 

 They receive lymph from the frontal and parietal re- 

 gions of the scalp, from the orbit, the posterior part 

 of the nasal fossae, the upper jaw, and the hinder and 

 upper part of the pharynx. When enlarged these 

 glands may form one species of " parotid tumour." 



Stenson's duct is about two and a half inches 

 long, and has a diameter of one-eighth of an inch, its 

 orifice being the narrowest part. At the anterior 

 border of the masseter muscle the duct bends sud- 

 denly inwards to pierce the buccinator muscle. The 

 bend is so abrupt that the buccal segment of the duct 

 may be almost at right angles with the masseteric. 

 This bend should be taken into consideration in 

 passing a probe along the duct from the mouth. The 

 duct opens on the summit of a papilla placed on a 

 level with the second upper molar tooth. The course 

 of the duct across the masseter is represented by a line 

 drawn from the lower margin of the concha to a point 

 midway between the ala of the nose and the red 

 margin of the lip. It lies about a finger-breadth 

 below the zygoma, having the transverse facial artery 

 above it and the facial nerve below it. The duct has 



