264 HUMAN ANATOMY. 



They each consist of a body, or testicle proper, and an 

 epididymis. The latter consists of a head, body, and tail. 



The scrotum consists of the skin marked in the median line 

 by the raplie, formed by the union of the genital folds, and the 

 dartos, a reddish, contractile tissue which surrounds the testes 

 and extends from the raphe to the under surface of the penis, 

 forming the septum scroti, which divides it into two cavities for 

 the testes. 



The spermatic cord is made up of the following struc- 

 tures : 



External spermatic, or intercolumnar fascia; 



Cremaster muscle; 



Internal spermatic fascia, or fascia propria; 



Vas deferens; 



Spermatic artery; 



Deferential artery from superior vesicle; 



Cremasteric artery, from epigastric; 



Vasa spermatica; 



Lymphatic vessels; 



Spermatic plexus of nerves [from renal and aortic plexuses] ; 



Genital branch of genito-crural; 



Scrotal branch of the ilio-inguinal. 



It commences at the internal abdominal ring, passes ob- 

 liquely through the inguinal canal, emerges at the external ab- 

 dominal ring, descends into the scrotum, and terminates at the 

 posterior border of the testes. 



The external spermatic or intercolumnar fascia is derived 

 from the aponeurosis of the external oblique muscle. This mus- 

 cle arises within the inguinal canal from Poupart's ligament and 

 pubic spine, and descends along the cord in loops. Its fibres are 

 striated. 



The cremaster muscle, or cremasteric fascia or middle sper- 

 matic fascia, is derived from the lower border of the internal 

 oblique and transversalis muscle. 



The internal spermatic fascia, or fascia propria, is the in- 

 fundibuliform process of the transversalis fascia. 



The proper coverings or tunics of the testicle are three 

 tunica vaginalis, tunica albuginea, and tunica vasculosa : 



The tunica vaginalis is a serous membrane surrounding the 

 testes, and at the posterior portion is reflected on itself to form 

 a sac. The outer portion of the latter is loosely attached, except 

 at the lower part of the testicle, where the gubernaculum testis 

 binds it down. 



The tunica albuginea is a dense, white, fibrous structure, 

 continuous at the upper part with a similar structure on the 

 epididymis. At the back part it projects into the glandular sub- 



