Page 465 - Anatomy and Physiology of Farm Animals, 8th Edition

450 / Anatomy and Physiology of Farm Animals

Vesicular gland Prostate gland Bulbourethral gland
Ductus
VetBooks.ir deferens

Ureter Ampulla

Urinary bladder

Penile urethra

Figure 24-10. Accessory sex glands of the bull.

Table 24-2. Accessory Sex Glands of the Male
Species Ampullae Prostate Vesicular Glands Bulbourethral
Glands
Stallion Large Body has two undisseminated Large and sac‐like Present
lobes
Bull Small Small body, disseminated Moderate size, lobulated Present
covered by urethralis muscle
Ram/Buck Small Disseminated part only Moderate size, lobulated Present
Boar Absent Small body, disseminated Very large size, lobulated Very large
covered by urethralis muscle

Ampullae separately from the ductus deferentia. The
vesicular glands of the stallion are hollow,
The ampullae are glandular enlargements pear‐shaped sacs; those of the bull, ram,
associated with the terminal parts of the and boar are lobulated glands of consider-
ductus deferentia. They are well developed able size.
in the stallion, bull, and ram and absent in
the boar. Glands of the ampullae empty
into the ductus deferentia and contribute Prostate Gland
volume to the semen.
The prostate gland is an unpaired gland
that more or less surrounds the pelvic ure-
Vesicular Glands thra. In farm animals the prostate gland
comprises various combinations of diffuse
The vesicular glands (formerly called and compact parts extending along the
seminal vesicles) are paired glands associ- pelvic urethra deep to the urethral muscle.
ated with the genital fold. In most domestic The multiple ducts of the prostate gland
species, each vesicular gland merges with open in two parallel rows, one on each side
the ipsilateral ductus deferens, creating the of the lumen of the pelvic urethra. The
short ejaculatory duct, which empties prostate produces an alkaline secretion
into the pelvic urethra. In the boar, the that gives semen its characteristic odor.
vesicular glands open into the urethra Testosterone and other androgens are