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Accessory Sex
Glands. The accessory sex glands include the seminal vesicles, the
prostate gland and the bulbourethral glands. These glands secrete or
contribute fluids which give the semen a characteristic composition such as
buffering fluids and albumin.
Penis. A stallion's penis is likely over 50 cm long in the relaxed
state with 15-20 cm lying in the prepuce. During erection the size increases
about 2 fold. The penis is roughly divided into the head, body and glans.
The glans, or free end of the penis, is bell shaped particularly during
erection and ejaculation. The urethral process extends approximately one
inch from the surface of the deep depression or fossa glands.
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