File:The anatomy of the domestic animals (1914) (17572839364).jpg

Title: The anatomy of the domestic animals
Identifier: anatomyofdomesti00sissuoft (find matches)
Year: 1914 (1910s)
Authors: Sisson, Septimus, 1865-1924
Subjects: Veterinary anatomy
Publisher: Philadelphia Saunders
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: Internet Archive

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THE PREPUCE 583 the penis when not erect. It consists of two parts, external and internal. The external part or sheath extends from the scrotum to within two or three inches of the umbihcus, where the external layer is reflected ventrally and laterallj', forming the thick margin of the preputial orifice (Ostium prsputiale); dorsally it is directly continuous with the integiuneut of the abdominal wall. It is marked by a median raphe praeputii, a continuation of the scrotal raphe. At the lower margin of the pre- putial orifice there are often in the stallion two papillae, which are regarded as rudimentary teats. The internal layer passes backward from the preputial orifice a distance of about six to eight inches (ca. 15 to 20 cm.), lining the cavity of the ex- ternal part of the prepuce, and is then reflected forward until it approaches the orifice, where it is again reflected backward. It thus forms within the cavity of the sheath a secondary tubular invagination, the prepuce proper, in which the anterior part of the penis lies. This tubular cavity is closed behind by the reflection of the internal layer on to the peni^ to funn the pinilc layer of tlie prepuce. Its orifice is
Text Appearing After Image:
Fig. 520.—Sagittal Sectiox of Prepuce and Part of Penis of Horse. P, Internal part of prepuce or prepuce proper; J", external part of prepuce or sheath; Cp,, preputial cavity; F.g., fossa glandis; /), diverticulum of fossa glandis; P.w., processus urethrae. surrounded by a thick margin, the preputial ring (Annulus pra'putialis), which is connected ventrally with the external part by the preputial frenum (Frenulum praeputii). The arrangement differs from that fomid in man in the fact that the inner part of the pre- puce as described above is equivalent to the entire human prepuce. This part, the prepuce proper, is well seen on sagittal sections, and can be ilrTiionsiiMtt'd by )mllinL; the penis, enclosed in this prepuce, out of the cavity of the sheath; the ananiiciuint i>l iji. In.- jiart of the penis and prepuce is then like that in man. (In paraphimosis the prnis is Flraiigulatnl by the preputial ring.) The external pai-t might be distmguished as the sheath or vagina penis. Structure.—The outer skin of the external part resembles that of the scrotum. The internal layers of skin, as far as the preputial ring, are almost hairless, variable in color, and often irregularh^ pigmented; thej' form irregular folds, and are supplied with numerous large sebaceous glands and coil glands, which reach their greatest size at the ring. Beyond this the glands are absent, and the skin resembles a non- glandular mucous membrane. The secretion of the preputial glands (Glandulse prseputiales), together \\-ith descpiamated epithelial cells, forms the fatty smegma prffiputii, which has a strong, unpleasant odor, and often accumulates in consitlerable

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