584 



GENITAL ORGANS OF THE STALLION 



amount. Beneath the skin there is a large amount of loose connective tissue, 

 except over the gians penis, where the skin is closely attached to the tunic of the 

 erectile tissue. The external part of the prepuce is strengthened by a layer of 

 elastic tissue, derived from the abdominal tunic, and termed the suspensory liga- 

 ment of the prepuce. 



Vessels and Nerves. — The arteries are branches of the external pudic artery, 

 and the veins go chiefly to the external pudic vein. The l5Tnph vessels go to the 

 superficial inguinal and lumbar lymph glands. The nerves are derived from the 

 pudic, ilio-hypogastric, and ilio-inguinal nerves. 



THE MALE URETHRA 



The male urethra (Urethra masculina) is the long mucous tube which extends 

 from the bladder to the glans penis. It passes backward on the floor of the pelvis, 



Lateral lobe of prostate 



Orifice of uterus masculinus 



Ducts of lateral urethral 

 glands 



Colliculus scminalis 



Duels of bulho-urethral 

 glands 



Fig. 521. — Pelvic Urethra and Posterior Part of Bladder of Horse Slit Ventrally and Laid Open. 

 e.d., openings of ductus deferentes and ducts of vesiculee seminLiles. 



turns around the ischial arch, forming a sharp bend, and passes forward as a part of 

 the penis, enclosed in the corpus cavernosum urethrae. It may, therefore, be divided 

 into two parts, pelvic and extrapelvic. 



The pelvic part (Pars pelvina) is four or five inches (ca. 10 to 12 cm.) long. 

 At its origin it is not distinguishable from the neck of the bladder in size or structure; 

 in fact, no line of demarcation exists between the two. Behind the prostate the 

 tube dilates to a potential width of two inches or more (ca. 5 to 6 cm.). Near the 



