ANATOMY IN A NUTSHELL. 567 



through the inguinal canal with the vas deferens andsupplies the Cremasteric 

 muscle. 



4. The spermatic artery, which is a branch of the abdominal aorta, passes 

 over the Psoas muscle to the internal abdominal ring, then through the inguinal 

 canal into the scrotum to the testicle. It gives off the following branches, 

 (a) ureteral branchesto theureter, (b) cremasteric branches to the Cremasteric 

 muscle, (c) epididymal to the epididymis, (d) testicular branches to the bpdy 

 of the testis. 



5. The spermatic veins, or pampiniform plexus, surrounds the artery. 



(i. Spermatic plexus of nerves (sympathetic) accompanying the artery. 



7. The vas aberrans is a blind tube connected with the epididymis or vas 

 deferens. Its homologue is the duct of Gartner in the female. 



8. The lymphatics which pass with the veins. 



9. The Internal cremasteric muscle, which is composed of smooth muscu- 

 lar fibers. 



10. The obliterated processes vaginalis of the peritoneum, which is a relic 

 of the tube between the tunica vaginalis and the peritoneum. 



11. A branch of the ilio-inguinal nerve. 



12. A branch of the ffenito-crural nerve. 



LESSON CXCVII. 



The infundibuliform fascia which is from the transversalis fascia, the 

 cremasteric fascia which is from tin 1 Internal oblique muscle, the intercolumnar 

 fascia which is from the external spermatic fascia, the superficial fascia and the 

 skin of the scrotum, all these are coverings of the spermatic cord from within 

 outward. 



The vesicula? seminales are two lobulated membranous pouches between 

 the base of the bladder and the rectum, and they serve as reservoirs for the 

 semen, as well as secrete the fluid which is added to the semen. They have 

 three coats, an external or fibrous coat, a middle 1 or muscular coat, and an in- 

 ternal or mucous coat. 



The ejacnlatory duct is about an inch long and is formed by the union of 

 the vas deferens and the vesicula seminalis. Its diameter is aboul one-eighth 

 of an inch above, but where it opens it is about one-fill ieth of an inch. 1 1 opens 

 on the verti montanum on either side of the opening of the sinus pocularis. 



The testicles are two in number and aresuspended by the spermatic cords. 

 They weigh less than an ounce and are about an inch and a half long, and inch 

 and a quarter deep, and about an inch in thickness. They secrete the seminal 

 fluid. They have the following coverings from within outward. 



1. The tunica vaginalis, which is ;i serous covering formed by ;i portion of 

 the peritoneum which descended with the testicle and afterwards forms a closed 

 pouch investing it. This tunica consists of two layers, a visceral ami :i parietal 

 layer. Beneath the tunica vaginalis is the tunica albuginea which i^ ; i strong 

 fibrous coat (Plate CCLXXVII) ; and beneath this coat, the tunica vasculosa 

 (pia mater testis) which is composed chiefly of blood vessels held together by 



