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92 GENITAL ORGANS OF THE BOAR 
vided into lobules. Many of the tubules are extremely wide (as much as 2 mm. in diameter), and 
are beset with bay-like extensions and short, wide branches. These axial spaces of the lobules are 
succeeded by the efferent ducts. The cavities are lined by a single layer of columnar cells. The 
secretion is thick and turbid, and has an acid reaction. 
The prostate consists of two parts, as in the ox. The body is about an inch 
(2.5 em.) wide, and overlies the neck of the bladder and the urethra at their june- 
tion. It is concealed by the vesiculxe seminales. The pars disseminata forms a 
layer which surrounds the pelvic part of the urethra, and is covered by the urethral 
muscle, except dorsally. 
The uterus masculinus is small, and appears to be inconstant. 
The bulbo-urethral glands are very large and dense. 
527.—GENITAL ORGANS OF Boar. 
Fe. 
a, Testicle; 6, epididymis; c, ductus deferens; d, spermatic artery; 
‘, excretory ducts of vesicule; /, body of prostate; 
h, urinary bladder; 7, 
e, vesicula seminalis; ¢ 
urethral muscle; k, 
a 
spiral anterior part of penis, exposed by slitting open prepuce; m, ori- 
g, bulbo-urethral gland; 
bulbo-cavernosus muscle; /, penis; l’, sigmoid flexure of penis; 
fice of preputial pouch; m, retractor penis muscle. The vesicule sem- 
inales are drawn outward to show the structures which, in the natural 
position, are covered by them. (Ellenberger-Baum, Anat. d. Haustiere.) 
to 20 inches (ca. 45 to 50 em.) in length. 
The bulbo-cavernosus is very strong but short. 
They are somewhat 
cylindrical, and lie on either 
side of and upon the posterior 
two-thirds of the pelvic ure- 
thra.t. In a large boar they 
are about five inches (ca. 12 
em.) in length and an inch or 
more (ca. 2.5 to 3 cm.) im 
width. They are partially 
covered with a layer of stri- 
ated muscle (M. bulbo-glan- 
dularis), and have a lobulated 
surface. Each gland has a 
large excretory duct which 
leaves at the deep face of the 
posterior part, perforates the 
dorsal wall of the urethra at 
the ischial arch, and opens in 
a cul-de-sac covered by a fold 
of mucous membrane. 
It is to be noted that these 
aecessory glands are very small in 
animals which have been castrated 
early; the bulbo-urethral glands may 
be only about an inch long in such 
subjects. 
The penis resembles in 
general that of the ox. The 
sigmoid flexure is, however, 
prescrotal. The anterior part 
has no glans, and is’ spirally 
twisted, especially im erection. 
The external urethral orifice is 
slit-like and is situated ventro- 
laterally, close to the pointed | 
extremity. The penis in the 
adult boar measures about 18 
Its muscles resemble those of the bull. 
The retractor penis arises from | 
the third and fourth sacral segments; its two parts run backward and a little | 
. . I 
ventrally on each side of the rectum to the perineum, where they reach the urethral 
surface of the penis; they end on the ventral curve of the sigmoid flexure of the penis. 
1 When hardened in situ, they are in great part three sided, with rounded edges. They are in | 
f : ; The | 
contact with each other to a considerable extent and cover the urethra dorsally and laterally. The | 
urethral muscle partly covers their lateral surfaces. | 
