1154 



MALE GENERATIVE ORGANS. 



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 perinaeum, 



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. 738. 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. 



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

 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 of the 

 pillars of the external abdominal ring, during the descent of the testes in the 

 foetus, which is prolonged downward around the surface of the cord and testis. It 

 is separated from the dartos by loose areolar tissue, which allows of considerable 

 movement of the latter upon it, but is intimately connected with the succeeding 

 layers. 



The cremasteric fascia consists of scattered bundles of muscular fibres 

 (Cremaster muscle) connected together into a continuous covering by intermediate 

 areolar tissue. The muscular fibres are continuous with the lower border of the 

 Internal oblique muscle of the abdomen. 



The fascia propria is a thin membranous layer which loosely invests the 

 surface of the cord. It is a continuation downward of the infundibuliform process 

 of the fascia transversalis and the subperitoneal areolar tissue, and is acquired 

 during the descent of the testis in the foetus. 



