Title: The anatomy of the domestic animals
Identifier: cu31924001263270 (find matches)
Year: 1914 (1910s)
Authors: Sisson, Septimus, 1865-1924
Subjects: Veterinary anatomy
Publisher: Philadelphia ; London : W. B. Saunders Company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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578 GENITAL ORGANS OF THE STALLION — 1 THE VESICUL^ SEMINALES The vesiculas seminales (Fig. 517) are two elongated and somewhat piriform sacs, which he on each side of the posterior part of the dorsal surface of the blad- der. They are partly enclosed in "~^~^-_ the genital fold, and are related to the rectum dorsally. Their long axes are parallel with the ductus def- erentes and converge posteriorly. Each consists of a rounded blind end, the fundus; a middle, slightly narrower part, the body; and a pos- terior constricted part, the neck or duct. In the stallion they are about six to eight inches (ca. 15 to 20 cm.) long, and their greatest diameter is about two inches (ca. 5 cm.); in the gelding they are usually much smaller.^ The vesiculse are chiefly retro- peritoneal, but the fundus extends forward into the genital fold and hence has a serous covering. The excretory duct (Ductus excretorius) dips under the prostate, and opens in common with or alongside of the ductus deferens in a pouch of the mucous membrane on the side of the colliculus seminalis. Structure.—The wall, exclusive of the partial serous coat, consists of a fibrous adventitia, a middle muscular coat, and a mucous lining. The muscular coat is thickest at the fundus, and consists of two planes of longitudinal fibers with a circular layer between them. The mucous membrane is thin, and is arranged in numerous folds and projections which form a network; th§ spaces so enclosed .present the openings of tubulo-alveolar glands. The epithe- lium is' columnar. The blood-supply is derived- from the internal pudic artery.
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Fig. 517.—Internal Genital Organs op Staluon; Dorsal View. On left side urethral muscle has been removed over bulbo- urethral gland. Cornua of uterus masculinus are indicated in genital fold. The posterior limit of the peritoneum is shown but not marked. 1, Round ligament of bladder; 2, lateral liga- ment of bladder; 3, bulbo-urethral gland. THE PROSTATE The prostate (Prostata) is a lobulated gland which lies on the neck of the bladder and the begiiming of the urethra, ventral to the rectum. It consists of '1 Sometimes one or both of the vesiculse are very large in the gelding. The writer has seen four cases in the dissecting room, three of which were bilateral, the other unilateral. The vesicula resembled the urinary bladder in appearance and contained ataout a quart of thick, amber-colored secretion.

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