SECTION II 



ANATOMY OF THE STRUCTURES 

 DIRECTLY INVOLVED 



The testicle is a structure that is composed of gland- 

 ular, vascular, nervous, and fibrous tissues, and its lo- 

 cation in the different animals varies somewhat. It is 

 supported more or less closely to the body by means 

 of the cremaster muscle, fibrous integuments of the 

 cord, and by the scrotum. The cremaster muscle has 

 its origin at the posterior portion of the inner abdom- 

 inal ring, and, according to Sisson, originating from 

 the iliac fascia near the origin of the sartorious. The 

 distal attachment is by means of the tunica vaginalis 

 communis. 



The spermatic cord consists of fibro-areolar struc- 

 ture loosely enveloping arteries, veins, nerves, and the 

 vas deferens. The spermatic artery is given off from 

 the aorta, and the spermatic vein furnishes a means 

 of return for the blood. Lymph vessels accompany 

 the vein and empty into the lumbar lymph glands. 



The vas deferens, which is also contained within 

 the spermatic cord, is a continuation of the epididymis, 

 separating itself from the vessels located in the anterior 

 portion of the cord, as it enters the urogenital fold. 

 The nerve supply is derived from the renal and pos- 

 terior mesenteric plexuses. 



The scrotum or pouch containing the testicles is 

 composed of layers derived from the skin and other 

 integument forming the abdominal wall, and from 

 without inward are the skin, dartos, scrotal fascia, 



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