268 HUMAN ANATOMY. 



The walls of the vas are very thick and the canal very small. 

 Its course for the most part is straight, but beneath the bladder 

 it becomes enlarged, tortuous, and more capacious, but again 

 contracts near its termination. 



The arteries of the cord are : 



The spermatic, to the testicle from the aorta; 



The vas deferens, or deferent artery, from the superior vesical; 



The cremasteric, from the deep epigastric. 



The veins from the testis spermatic veins unite with 

 branches from the epididymis to form the pampiniform plexus, 

 which terminates on the left side, passing beneath the sigmoid 

 flexure in the left renal vein, on the right side in the inferior 

 vena cava. 



The lymphatics are numerous, and terminate in the lumbar 

 glands. 



The nerves are from the sympathetic system, and form the 

 spermatic plexus. 



The arteries of the scrotum are derived from the 



Cremasteric branch of epigastric; 



Superficial external pudic, from the femoral; 



Deep external pudic, from the femoral ; 



Superficial perinea!,- branch of internal pudic, from internal iliac. 



The seminal vesicles are two membranous pouches, closely 

 adhering to the under surface of the bladder. 



Their size varies, but they usually measure two and one-half 

 inches in length, one-half inch in breadth, and two to three 

 lines in thickness. 



Each consists of a tube closed at one end, about four to six 

 inches long, the diameter of a quill, convoluted into a mass. Its 

 structure is analogous to that of the ducts, but thinner. 



The ejaculatory ducts, two in number, are formed by the 

 union of the vasa deferentia with the duct of the vesiculaa semi- 

 nales. Each duct is three-fourths to one inch in length, and 

 passes through the prostate gland to terminate at the margin 

 of the sinus pocularis by a slit-like orifice. 



The arteries are derived from the inferior vesical and middle 

 haBmorrhoidal. The veins and lymphatics correspond, and the 

 nerves are from the hypogastric plexus of the sympathetic. 



The seminal vesicles are not only reservoirs, but secrete a 

 fluid to dilute the spermatic liquid. 



The semen is a viscid, whitish liquid, composed of a color- 

 less liquid, the liquor seminis, and the spermatozoa and seminal 

 granules. 



