584 GENITAL ORGANS OF THE STALLION 
amount. Beneath the skin there is a large amount of loose connective tissue, 
except over the glans 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 lymph vessels go to the 
superficial inguinal and lumbar lymph glands. The nerves are derived from the 
pudie, 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 
ia A 
2 525 Colliculus seminalis 
=o a 
Prostate 
ducts 
Orifice of uterus masculinus 
Ducts of buldo-wrethral 
glands 
Ducts of lateral urethral 
glands 
Fie, 521.—Pextvic UretHra AND Postertor Part oF BLApDER OF Horse Suit VENTRALLY AND Latip OPEN. 
e.d., openings of ductus deferentes and ducts of vesicula seminales. 
turns around the ischial arch, forming a sharp bend, and passes forward as a part of 
the penis, enclosed in the corpus cavernosum urethra. 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 em.) 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 em.). Near the 
