. The anatomy of the domestic animals . Veterinary anatomy. 580 GENITAL ORGANS OF THE STALLION stitial tissue is much less abundant, and contains much less muscular tissue; hence the lobulation is not very distinct. The parenchyma consists of large collecting tubules, into which numerous side branches open; these are lined with cubic epithelium. 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 bloo
. The anatomy of the domestic animals . Veterinary anatomy. 580 GENITAL ORGANS OF THE STALLION stitial tissue is much less abundant, and contains much less muscular tissue; hence the lobulation is not very distinct. The parenchyma consists of large collecting tubules, into which numerous side branches open; these are lined with cubic epithelium. 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 cjdindrical 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 this, about 6 to 8 inches (ca. 15 to 20 cm.) is free in the prepuce. In erection it increases 50 per cent, or more in length. Deep artery {from internal pudic) /l| Dorsal nrlenj {from Corona glandis fU external pudic) Colhnn glandis Pruc. dorsalis glandis. Retractor penis muscle BODY Fig, 518.—Pexis of Hohse; Lateral Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sisson, Septimus, 1865-1924. Philadelphia ; London : W. B. Saunders Company
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