132 THE STOCK owner's ADVISEE. 



pended by tlie sijermatic cord. The left is supposed to liang 

 somewhat lower than the right in most cases. The vas deferens, 

 the continuation of the tube of the epididymis, is the excretory 

 duct of the testicle. It ascends along the inner side of the 

 testicle and epididymis, through tlie spermatic canal to the in- 

 ternal abdominal ring. The spermatic cord is composed of arte- 

 ries, veins, lymphatics, and the vas deferens. It extends from 

 the internal inguinal ring, where its component structures are 

 collected together through the inguinal canal, and in the scro- 

 tum as far as the summit of the testicles. The vesiculse semi- 

 nales are two reservoirs situated between the bladder and rectum. 

 They receive the semen from the vas deferens and secrete a fluid 

 which is mixed with that of the testicles. In these reservoirs 

 the sperm accumulates, and is expelled by the contractile walls 

 of the vesiculse, during the act of copulation, through the ejacu- 

 latory ducts into the urethra. The ejaculatorv ducts, one on each 

 side, are formed by the junction of the duct of the vesiculae semi- 

 nales with the vas deferens. The urethra is a tube which extends 

 from the neck of the bladder to the glans penis. It consists of 

 two layers, a mucous and an external fibrous. It is divided into 

 prostatic, membranous, and spongy portions. 



The penis is the organ of copulation, and is divided by anato- 

 mists into a root, body, and extremity or glans penis. The root 

 is attached to the j^nbis by two fibrous processes. The substance 

 of the penis is formed of what is called erectile tissue, a tissue 

 which, under certain circumstances, becomes enonnously dis- 

 tended with blood. The erectile structures are two in number, 

 the corpus cavernosum and the corpus spongiosum. The corpus 

 cavernosum, nuicli the larger of the structures, forms the supe- 

 rior and lateral portions of the penis. The corpus spongiosum 

 encloses the urethra, is situated in the inferior groove of the 

 corpora cavernosa, and is surrounded by the accelerator muscles. 

 The glans penis forms the terminal extremity of the penis, and 

 is an enlargement of the corpus s]iongIosum. At its apex is a 

 deep fossa, in the center of which lies the meatus urinarius. 



