REPRODUCTION 73* 



The vas dcferens, the excretory duct of the testicle, is about 60 cm. in 

 length and from 2 to 3 mm. in diameter, and extends upward from^th 

 epididymis to the inguinal canal, through which it passes into the abdominal 

 cavity and then to the under surface of the base of the bladder, where 

 unites with the duct of the vesicula seminalis to form the ejaculatory duct. 



The vesiculse seminales are two lobulated pyriform bodies, about 40 

 mm in length, situated on the under surface of the bladder. Each vesicuk 

 seminalis consists of an external fibrous coat, a middle, muscular coat, and 

 internal mucous coat. The mucous coat contains a number of smi 

 tubular albumin-producing glands which secrete a characteristic fluid. 



The ejaculatory duct, formed by the union of the vas deferens and th 

 duct of the vesicula seminalis, opens into the prostatic portion of 1 



(Fl Theprostate gland is a musculo-glandular mass surrounding the 

 posterior extremity of the urethra. It contains a large number of tubu 

 more or less branched and convoluted, and lined by columnar epithelium, 

 Thev secrete a fluid which is poured into the urethra at the time of the ejacu- 

 lation of semen and impart motility to the spermatozoa or spermia 

 ' The penis consists of three parts: the corpus spong^osum below through 

 which passes the urethra, and the two corpora cavernosa, one on ei 



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dorsum of the penis and unite to form a large vein by which the blood is r 



