. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 320 REPTILIA. of the penis a canal which at one extremity ostrich. There is no erectile tissue discernible communicates with the cavity of the peri- except at the root of the corpora cavernosa, Fis. 238. Fie. Section of the Penis of the Tortoise to show its internal Structure. (After Sojanus.) 10, tendinous floor of urethral groove; 55', ten- dinous insertions of the retractor muscles of the penis; f, tendinous walls of the urethral groove enclosing the peritoneal canals ; e, lateral cavernous substance of the peni
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 320 REPTILIA. of the penis a canal which at one extremity ostrich. There is no erectile tissue discernible communicates with the cavity of the peri- except at the root of the corpora cavernosa, Fis. 238. Fie. Section of the Penis of the Tortoise to show its internal Structure. (After Sojanus.) 10, tendinous floor of urethral groove; 55', ten- dinous insertions of the retractor muscles of the penis; f, tendinous walls of the urethral groove enclosing the peritoneal canals ; e, lateral cavernous substance of the penis; 4, median cavernous sub- stance separated from the preceding by the tendinous septum 9 ; 5, urethral groove bounded on each side by the cavernous bodies. toneum on each side of the bladder, and by its other end it is prolonged into the substance of the penis as far as the glans, where it ter- minates in a cul-de-sac, without being per- forated by any orifice throughout its whole extent. The penis of the Chelonians is furnished with two retractor muscles (fig. 239. 55), which arise from the pelvis, and are prolonged as far as the under surface of the glans ; these fold up the organ into the cloaca in such a manner that it closes up the orifice of the rectum, and also that of the urinary bladder, as in the ostrich. Erection is doubtless produced by the action of the sphincter muscle of the cloaca. In Crocodiles the penis is likewise single, and not enclosed in a sheath like that of other Saurians and of Ophidians. This penis is conical in shape, and is grooved along the whole length of its dorsal region by a deep urethral furrow : it is principally composed of a fibrous and elastic corpus cavernosum, the texture of which is very firm. That portion which represents the glans is softer than the rest, being composed of vascular and erectile tissue: it advances above the apex of the corpus cavernosum, and is prolonged beyond it, so that there are two points thus formed, one situa
Size: 1391px × 1796px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
