THE TESTES AND THEIR COVERINGS. 



1015 



Skin 1 



Scrotum. 



Dartos / 



Intercolumnar, or External spermatic fascia. 



Cremasteric fascia. 



Infundibuliform, or Fascia propria (Internal spermatic fascia). 



Tunica vaginalis. 



The Scrotum is a cutaneous pouch Avhich contains the testes and part of the 

 spermatic cords. It is divided on its surface into two lateral portions by a median 

 line, or raphe, which is continued forward to the under surface of the penis and 

 backward along the middle line of the perineum to the anus. Of these two lateral 

 portions, the left is longer than the right, and corresponds with the greater length 

 of the spermatic cord on the left side. Its external aspect varies under different 

 circumstances : thus under the influence of warmth and in old and debilitated 

 persons it becomes elongated and flaccid, but under the influence of cold and in 

 the young and robust it is short, corrugated, and closely applied to the testes. 



The scrotum consists of two layers, the integument and the dartos. 



The integument is very thin, of a brownish color, and generally thrown into 

 folds or rugae. It is provided with sebaceous follicles, the secretion of which has 

 a peculiar odor, and is beset with thinly-scattered, crisp hairs, the roots of which 

 are seen through the skin. 



The dartos is a thin layer of loose reddish tissue, endowed with contractility : 

 it forms the proper tunic of the scrotum, is continuous, around the base of the 

 scrotum, with the two layers of the superficial fascia of the groin and perinseum, 



Skin. 

 Dartos. 



External spermatic fascia. 



Cremasteric fascia. 

 Infundibuliform fascia. ... 

 Parietal tunica vaginalis. 

 Visceral tunica vaginalis 



Tunica albuginea. ... 

 A lobule of the testicle 



A septum \_ 



Mediastinum^ 

 Digital fossa 

 Spermatic vein.^ 

 Epididymis. 



Vas deferens. 



Artery to vas. 

 Spermatic artery 

 Internal muscular 

 tunic of Kolliker. 



FIG. 565,-Transverse section through the left side of the scrotum and the left testicle. The sac of the 

 tunica vaginalis represented in a distended condition. (Delepine.) 



and sends inward a distinct septum, septum scroti, which divides it into two 

 cavities for the two testes, the septum extending between the raphe and the under 

 surface of the penis as far as its root. v a. 



The dartos is closely united to the skin externally, but connected with t 

 subjacent parts by delicate areolar tissue, upon which it glides with the greatest 

 facility. The dartos is very vascular, and consists of a loose areolar tissue con- 

 taining unstriped muscular fibre, but no fat. Its contractility is slow, and excited 

 by cold and mechanical stimuli, but not by electricity. 



The intercolumnar fascia is a thin membrane derived from the margin ot the 



