THE TESTICLE AND EPIDIDYMIS 455 



a median ridge, the raphe, which runs from the penis along 

 the scrotum and perineum to the anus. The scrotum con- 

 sists of a layer of skin and the dartos. 



The skin is thin and dark, and presents folds or rugse, is 

 covered with hairs thinly scattered, and is furnished with 

 sebaceous glands. 



The dartos is a thin contractile tunic, of a reddish color, 

 continuous with the superficial fascia of the groin and peri- 

 neum; it is very vascular, and is composed of loose areolar 

 tissue and unstriped muscle. It sends in a partition, the septum 

 scroti, which separates the two testes, and is attached to the 

 under surface of the penis and to the raphe. 



The testicle is covered from without inward by the following 

 structures: The scrotum, composed of skin and dartos; the 

 intercolumnar or external spermatic fascia; cremasteric fascia; 

 infundibuliforrn fascia, or internal spermatic fascia; tunica 

 vaginalis. 



The intercolumnar fascia, separated by loose areolar tissue 

 from the dartos, is attached to and descends from the margins 

 of the pillars of the external ring. 



The cremasteric fascia consists of scattered muscular loops 

 or bundles (cremaster muscle), connected together by areolar 

 tissue, the former being continuous with the lower border of 

 the internal oblique. 



The infundibuliform fascia is continuous above with the 

 fascia transversalis and the subserous areolar tissue of the 

 peritoneum. These two together, the latter being underneath, 

 form the fascia propria. It invests the surface of the cord and 

 sends in septa between its component parts. 



The tunica vaginalis (see Testicle proper). 



THE TESTICLE AND EPIDIDYMIS 



Each testicle is ovoid, flattened from side to side, and sus- 

 pended obliquely (the left being somewhat the lower), its 

 upper end being directed forward, outward, and upward, 

 the lower in the opposite direction. Each is 1^ inches long, 

 lj inches wide, and less than 1 inch thick, and weighs f to 1 

 ounce. 



The front, sides, and both ends of the testis are free, smooth, 



