. The anatomy of the domestic animals . Veterinary anatomy. 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 umbilicus, where the external layer is reflected ventrally and laterally, forming the thick margin of the preputial orifice (Ostium praeputiale); dorsally it is directly continuous with the integument of the abdominal wall. It is marked by a median raphe prseputii, a continuation of the scrotal raphfe. At the lower margin of the pre- putial orifice there ar
. The anatomy of the domestic animals . Veterinary anatomy. 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 umbilicus, where the external layer is reflected ventrally and laterally, forming the thick margin of the preputial orifice (Ostium praeputiale); dorsally it is directly continuous with the integument of the abdominal wall. It is marked by a median raphe prseputii, a continuation of the scrotal raphfe. 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 penis to form the penile layer of the prepuce. Its orifice is â ^hdorrtihal Fig. 520.âSagittal Section of Prepuce and Part op Penis op Horse. P, Internal part of prepuce or prepuce proper; P', external part of prepuce or sheath; , preputial cavity; , fossa glandis; D, diverticulum of fossa glandis; , processus urethrse. surrounded by a thick margin, the preputial ring (Annulus praputialis), which is connected ventrally with the external part by the preputial frenum (Frenulum prseputii). The arrangement differs from that found in man in the fact that the inner part of the pre- puce as described above is equivalent to the entu-e human prepuce. This part, the prepuce proper is well seen on sagittal sections, and can be demonstrated by puUmg the penis, enclosed in this'prepuce, o
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