GENITAL ORGANS OF THE BULL 



587 



the extra-mgumal part of the cord is about eight to ten inches (20 to 25 cm.) in 

 length. _ The cremaster extemus is well developed, and almost completely encloses 

 the tunic to the neck of the scrotum; it is inserted about at the level of the upper 

 pole of the testicle. The vaginal ring is relatively very small, and is about four 

 mches (ca. 10 cm.) from the hnea alba. The cremaster internus is feeble. 



The spermatic cords emerge through the lateral angles of the subcutaneous inguinal rings, and 

 m'Z '^,T'^''''''i ^'i .^^^^'■d to the neck of the scrotum. The rings are about four inchls (ca. 

 H?,^?K ■^' T '"'"'' ^^° ff? t""^^ *°,^^''«® '"""^"^ (6 to 8 cm.) apart. In animals in good condi- 

 tion there is a large mass of fat above the neck of the scrotum, between the spermatic c^rds. The 

 mesorchmm extends to the bottom of the tunica vaginalis, forming a narrow fold (ca. 1 cm. wide) 

 which attaches the epididymis to the posterior part of the tunic. 



Vesicula seminalis 



Body of prostate 



External 

 urethral orifice 



Fig. 522. — General View of Genital Organs of Etjli- 



The inguinal canal presents several special features in the bull. The abdominal ring is very- 

 long. Its anterior border, formed by the edge of the internal oblique, is decidedly concave and 

 is tendinous in its medial part. The long axis of the subcutaneous ring is directed outward, for- 

 ward, and downward. The spermatic cord lies in its lateral part, the external pudic vessels in its 

 middle. A muscular band about an inch wide, detached from the internal oblique muscle, crosses 

 the lateral side of the vaginal ring. 



The ductus deferens is small in caliber and has a much thinner wall than that 

 of the horse. At first it pursues a fiexuous course upward along the posterior 

 border of the testicle, then becomes straight and has in the posterior part of the 

 spermatic cord. The genital fold is narrow, so that the dUcts are closer together 

 in it than in the horse. On reaching the posterior part of the bladder they are in 

 apposition for a distance of about four inches (10 cm.), flanked and overlapped by 

 the vesiculse seminales. They form ampililse. about four or five inches (10 to 12 cm.) 

 long and half an inch (1.2 to 1.5 cm.) wide, the mucous lining of which is pHcated. 

 They then pass under the body of the prostate and end, just medial to the ducts of 

 the vesiculse seminales, as slit-like openings on either side of the colHculus seminalis. 



The vesiculae seminales are not bladder-like sacs, as in the horse, but are 

 compact glandular organs with a lobulated surface. In the adult they measure 

 about four or five inches (ca. 10 to 12 cm.) in length, two inches (5 cm.) in width in 



