VAS DEFERENSYESICUL^E SEMINALES. 



743 



spread out on its inner surface, or pass through the fibrous septum in its interior, 

 to be distributed on the membranous septa, between the separate lobes. 



The artery of the vas deferens is a long slender vessel, which accompanies the 

 vas deferens, ramifying upon the coats of this duct, and anastomosing with the 

 spermatic artery near the testis. 



The cremasteric branch from the epigastric supplies the Cremaster muscle, and 

 other coverings of the cord. 



The spermatic veins leave the back part of the testis, and, receiving branches 

 from the epididymis, unite to form a plexus (pampiniform plexus), which forms 

 the chief mass of the cord. They pass up in front of the vas deferens, and unite 

 to form a single trunk, which terminates, on the right side in the inferior vena 

 cava, on the left side in the left renal vein. 



The lymphatics are of large size, accompany the bloodvessels, and terminate 

 in the lumbar glands. 



The nerves are the spermatic plexus from the sympathetic. This plexus is 

 derived from the renal and aortic plexuses, joined by filaments from the hypogastric 

 plexus, which accompany the artery of the vas deferens. 



YESICULJE SEMINALES. 



The Seminal Vesicles are two lobulated membranous pouches, placed between 

 the base of the bladder and the rectum, serving as reservoirs for the semen, and 



Fig. 373. Base of the Bladder, with the Vasa Deferentia 

 and Vesiculifi Semiuales. 



secreting some fluid to be added to that of the testicles. Each sac is somewhat 

 pyramidal in form, the broad end being directed backwards, and the narrow end 

 forwards towards the prostate. They measure about two and a half inches in 

 length, about five lines in breadth, and from two to three lines in thickness. 

 They vary, however, in size, not only in different individuals, but also in the same 

 individual on the two sides. Their upper surface is in contact with the base of 

 the bladder, extending from near the termination of the ureters to the base of the 

 prostate gland. Their under surface rests upon the rectum, from which they are 

 separated by the recto-vesical fascia. Their posterior extremities diverge back- 



