Title: The anatomy of the domestic animals
Identifier: anatomyofdomesti01siss (find matches)
Year: 1914 (1910s)
Authors: Sisson, Septimus, 1865-1924
Subjects: Veterinary anatomy
Publisher: Philadelphia, London, W. B. Saunders Company
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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580 GENITAL ORGANS OF THE STALLION stitial tissue is much less abundant, and contains much less muscular tissue; hence the loljulation is not very distinct. The parenchyma consists of large collecting tubules, into which numerous side branches open; these are lined with cubic epitlielium. In the larger septa there are striped muscle-fibers. Each gland has six to eight excretory ducts (Ductus excretorii) which open into the urethra on a series of small papillae behind the prostatic ducts and close to the median plane (Fig. 521). The blood-supply comes from the internal pudic artery which overlies the gland. THE PENIS The penis, the male organ of copulation, is composed essentially of erectile tissue, and encloses the extrapelvic part of the urethra. It extends from the ischial arch forward between the thighs to the umbilical region of the abdominal wall. It is supported by the fascia penis and the skin, and its prescrotal portion is situated in a cutaneous pouch, the prepuce or sheath. It is cylindrical in form, but much compressed laterally in the greater part of its extent. In the quiescent state it is about 20 inches (ca. 50 cm.) long; of tliis, about 6 to S inches (ca. 1.5 to 20 cm.) is free in the prepuce. In erection it increases 50 per cerit. or more in length. Deep artery (from iiilernal pudic) Dorsal artery (from Corona glandis external pudic) Collum glandis Proc. dorsalis
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Retractor penis muscle BODY Via. 518.—Penis of Hohse; Lateral View. It may be divided into a root, a body, and a terminal enlargement, the glans. The root of the penis (Radix penis) is attached to the lateral parts of the ischial arch by two crura, which converge and unite below the arch (Fig. 577). The urethra passes over the ischial arch between the crura, and curves sharply forward to become incorporated with the penis. The body of the penis (Corpus penis) begins at the junction of the crura and constitutes the bulk of the organ. At its origin it is attached to the symphysis ischii by two strong flat bands, the suspensory ligaments of the penis (Ligamenta suspensoria penis), which blend with the tenilon of origin of the graciles muscles (Figs. 518, 576). This part of the penis is flattened laterally for the most part, but becomes rounded and smaller anteriorly. It pre- sents four surfaces. The dorsum penis is narrow and rounded; on it arc the dorsal arteries and nerves of the jienis and a rich venous plexus. The urethral surface (Facies urethralis) is ventral; it is rounded, and along it runs the urethra, embedded in the deep urethral groove of the corpus cavernosum. The lateral surfaces are high and flattened, except anteriorly, where they are lower and rounded; thej- are covered to a large extent by a plexus of veins. The glans penis is the enlarged free end of the organ. Its anterior surface or base is surrounded by a prominent, denticulated margin, the corona glandis. The

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