204 



ELEMENTS OF MAMMALIAN ANATOMY 



The testes are two in number, contained in a pouch of 



integument called the scrotum, 

 which hangs beneath the anus. 

 Internally the scrotum is di- 

 vided into two chambers. By 

 dissecting away the adipose 

 tissue covering the spermatic 

 cord in the inguinal region 

 (Fig. 57) it may be seen that 

 the cord and the testes are en- 

 veloped by a tough sheath. 

 This is composed of cremasteric 

 fascia derived from the apo- 

 neurosis of the external oblique 

 muscle, and of the tunica vag- 

 inalis. 



During the fetal life the 

 testes lie in the abdominal 

 cavity, and when they descend 

 into the scrotum about the 

 time of birth, a double layer 

 of peritoneum is pushed down 

 before them through the in- 

 guinal canal, forming a diverti- 

 culum whose blind end lies 

 within the scrotum, while the 

 constricted portion forms a 

 channel for the vas deferens, 

 spermatic nerve, and vessels. 

 These three structures form 

 the spermatic cord (Fig. 57). 

 The fascia propria (tunica vag- 

 inalis communis) is insepara- 

 bly united with the adjacent 

 parietal layer of the peri- 



FiG. loi. — Ventral Aspect of the 

 Male Reproductive Organs. 

 cr. One of the crura of the penis; 

 ep, epididymis revealed by cutting 

 and reflecting; vg, a piece of the tunica 

 vaginalis and albuginea; et, external 

 abdominal ring; it, internal abdominal 

 ring; in, inguinal canal; g, glans penis; 

 gd, Cowper's bulbo-urethral glands; 

 pe, penis; pr, prostate gland; re, 

 rectum; /, testis from which the 

 tough sheath composed of the levator 

 scroti muscle and cremaster fascia 

 has been removed, leaving it en- 

 veloped by the tunica vaginalis; ts, 

 testicle from which a portion of the 

 tunica vaginalis and albuginea has 

 been reflected; uth, urethra; ur, ur- 

 eters; vd, spermatic cord; vdd, vas 

 deferens within the abdominal cav- 

 ity; vg, tunica albuginea reflected; 

 vg2, tunica albuginea; v, spermatic 

 vein. 



