THE SALIVABY GLANDS. 297 



§ 768. Vas deferens. — If tlie subject is a male, there will be seen 

 on each side a white cord, the vas deferens or speTinafliLct (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 penetiate the abdominal wail laterad of the A. 

 epigastrica and ventrad of Poupart's ligament. 



In traversing the abdominal Avail, it passes through the canalls 

 inguinalis. It is accompanied by the spermatic artery and vein 

 and a duplicature of peritoneum, and all together form the S2yer- 

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

 nal cavity is called the annuliis abdominalis internus or the internal 

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

 wall is called the annulus abdomhialls externus or external ab- 

 dominal ring (Fig. 39). 



From the external abdominal ring, the spermatic cord extends 

 obliquely caudad and eutad of the skin to the testis. 



THE SALIVARY GLANDS, MOUTH CAVITY, PHARYNX, 

 NECK, THORAX AND DIAPHRAGM. 



§ 769. — Nam-'s of Parts in the. Order of Examination. ~G'\a.ndw\& parotis— Ductus Ste- 

 nonianus — Glandula submay illaris — Ductus Whartonianus — Lingua — Piiarynx — Tuba 

 Eustacbiana — Larynx — Trachea — Oesophagus — Pleura — Thymus — Pulrao — Cardia — 

 Diaphraorma. 



Tlie vessels and nerves of thes3 parts are treated in Chap. VIII and IX. 



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

 mw (Fig. 2l),7Ujrpers (Fig. 11), baded bristles {% 13G), and about 100 cc. of the Berlin 

 blue Hol'it'on. 



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, 341 : Gegen- 

 baur (Lankester), A, 5^9 ; Milne Edward s A, VI, 230 ; Chauveau (Fleming), A ; Gurlt. 

 A, 36!. 



§ 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 upw^ard ; 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 

 (§§ 34.^, 352'. The femoral vein sliould be injected with ])lue plas- 



