THE MALE EXTERNAL GENITALS. 



467 



FIG. 471. Amputation of the 



the urethra dissected out for 1.25 cm. (^ in.), and the corpora cavernosa divided. 

 The arteries being tied, the two outer edges of the corpora cavernosa are brought 

 together in the median line. with three catgut sutures. The urethra is then slit up in 

 three places, one below and two above; the three square flaps so formed are then 

 turned back and their corners cut off. This makes three small triangular flaps which 

 when spread out form one large triangle. The skin is 

 then sutured accurately to the edges of this triangle and 

 no raw surface is left (Fig. 471). 



Scrotum, Testicles, and Spermatic Cord. 

 The SCROTUM is the bag in which the testicles are con- 

 tained. It consists of skin and dartos. The remaining 

 tissues covering the testicles are derived from the layers 

 of the abdominal wall and belong properly to them. 

 The skin is thin, loose, wrinkled, and contains sebaceous 

 glands which frequently become occluded, forming small 

 tense cystic tumors. The dartos is composed of loose 

 connective tissue and unstriped muscular fibres. It is in- penis. MUCOUS membrane of urethra 



, . , , r , . , , , everted, cut in triangular form and 



timately connected with the skin but moves freely on the sewed to the skin to avoid cicatrical 

 parts beneath. It is continuous with the general superficial c 



fascia and with its deep layer or Scarpa's fascia of the abdomen and Colles' s fascia of the 



perineum. It dips between the testicles, forming an incomplete septum (Fig. 472). 



Practical Applications. Contraction of the dartos wrinkles the scrotum and 



if wounded the edges are inverted. For this reason, in operations on the scrotum, 







permatic artery 

 Pampiniform plexus of veins 



Deferential artery 



Cremasteric fibres r 



Vas deferens 



Skin 

 lobus major epididymis 



Digital fossa 



Hydatid of Morgagni 



Dartos 



Tunica vaginalis 



Septum 



FIG. 472. Scrotum, testicles, and spermatic cord. 



if primary union is desired particular care must be taken to approximate accurately 

 the skin edges and prevent their inversion. The raising of the testicles is done by the 

 cremaster muscle and not by the ( trtos except incidentally as the scrotum contracts. 

 The scrotum is supplied b) dood through the perineal branches of the internal 

 pudic artery, and by the external pudic. On account of the looseness of the skin 

 attachment, oedema and extravasation of blood and urine may be very extensive and 

 violent. They readily impair the blood circulation and gangrene not infrequently 



