THE SALIVARY GLANDS. 297 



768. Vas deferens. If the subject is a male, there will be seen 

 on each side a white cord, the vas deferens or spermaduct (Fig. 101), 

 looping around the ventral side of the ureter and A. hypogastrica, 

 and then extending toward the urethra. 



If the vas deferens is traced peripherad, away from the urethra, 

 it will be seen to penetrate the abdominal wall laterad of the A. 

 epigastrica and ventrad of Poupart's ligament. 



In traversing the abdominal wall, it passes through the canalis 

 inguinalis. It is accompanied by the spermatic artery and vein 

 and a duplicature of peritoneum, and all together form the sper- 

 matic cord. The opening of the inguinal canal within the abdomi- 

 nal cavity is called the annulus abdominalis internus or the internal 

 abdominal ring, while the one on the ectal surface of the abdominal 

 wall is called the annulus abdominalis externus or external ab- 

 dominal ring (Fig. 39). 



From the external abdominal ring, the spermatic cord extends 

 obliquely caudad and entad of the skin to the fastis. 



THE SALIVARY GLANDS, MOUTH CAVITY, PHARYNX, 

 NECK, THORAX AND DIAPHRAGM. 



709. Names of Parts in the Order of Examination. Glandula parotis Ductus Ste- 

 nonianus Glandula submaxillaris Ductus Whartoniamis Lingua Pharynx Tuba 

 Eustacliiana Larynx Trachea (Esophagus Pleura Thy m us Pulmo Cardia 

 Diaphragm a. 



The vessels and nerves of these parts are treated in Chap. VIII and IX. 



770. Instruments and Material the same as for the abdomen with the addition of a 

 saw (Fig. 21), nippers (Fig. 11), leaded bristles ( 136), and about 100 cc. of the Berlin 

 blue solution. 



Choice of Specimen the same as for the abdomen. 



SALIVARY GLANDS. 



771. References. Quain, A, II, 335 ; Gray, A, 757 ; Bernard, A, 504 ; Chauveau, 

 A, 387 ; Leyh, A, 373 ; Owen, A, III, 396 ; Cuvier, A, III, 409 ; Hyrtl, A, 241 ; Gegen- 

 baur (Lank ester), A, 519 ; Milne-Edwards, A, VI, 220 ; Chauveaa (Fleming), A ; Gurlt, 

 A, 361. 



772. Posture and Preparation. The cat should be dorsicum- 

 bent, with a block crosswise under the neck, and the head rotated 

 dextrad so that the side of the face looks upward ; the mouth should 

 be held open with a cork. The animal should be injected from the 

 femoral artery, making the plaster somewhat thinner than usual 

 ( 345, 352). The femoral vein should be injected with blue plas- 



