FEMALE ORGANS. 



19 



10 to 11 inclies long. The cori)ora cavernosa are united, the lines of their nnion being 

 represented by a dense vertical plate. Between the two ventrally is a groove, the 

 stdcus urethralis, the Hoor of which is formed by the membranous corpus spongiosum. 

 The distal half of the penis is composed mostly of a hone^ club-shaped proximally and 

 expanded vertically at its distal end. Transverse sections of the penis show that this 

 bpue consists of the united and ossified terminal halves of the corpora cavernosa. 

 The posterior end of the corpus spongiosum forms no differentiated glans, but covers 

 the end of the bone simply as a thin membrane. The iirethra enters the penis at about 

 its middle, and opens to the exterior below the distal end. The penis is ordinarily 

 bent into a V-shaped position, the angle being at the anterior end of the bone. The 

 proximal unossifled half projects backward and the distal half forward below the other. 

 The female organs. — Each ovary is shaped somewhat like a spherical wedge with 

 the edge lying longitudinally and turned dorsally. It is also slightly notched so that 

 the ovary is kidney-shaped in dorso-veutral profile. It is connected with the liga- 

 menUim latum at the notch and near it on the inner surface with the anterior inner 

 aspect of the horn of the icterus 

 on the same side, the exterior of 

 the latter being directly continu- 

 ous with the ligamentvim latum 

 in front. Each ovary is inclosed 

 in a recurved fold of the suspend- 

 ing ligament forriiing a pouch 

 almost closed, a small opening 

 being left on the inner side near 

 the dorsal edge. The vagina is 

 wide and expands anteriorly. 

 Below the widened part it re- 

 ceives the urethra on its ventral 

 surface. The utertts is double; 

 the two horns diverge in front, 



but their approximated posterior ^'°- ^-I'-^^i'^ ^^^ spermatic vein of young male, natural sl.e. 



ends are coalesced for some distance. The distal end of each horn is rounded and 

 lies close to the ovar}^ of the same side. The very much convoluted Fallopian tube 

 enters very near the extremity on the anterior dorsal aspect. It runs forward to 

 the anterior end of the ovary, going ventral to it, and then runs backward again on 

 the inner side to near the posterior end. Here it opens on the inside of the ovarian 

 sac by a slightly enlarged mouth with plicated edges. The ovaries are supplied with 

 blood by vessels from the inferior vena cava and the abdominal aorta. The vagina 

 and uterus receive their blood from branches of the pelvic vessels. 



About 2 inches forward from the posterior opening of the vagina its inner walls 

 present a large backward-projecting fold. The free margin of this fold is very 

 irregular and above and below it is extended in two wide conical flaps. The free end 

 of the lower one is slit transversely and this fissure forms the vaginal opening of the 

 urethra. This fold separates a lower vestibular region of the vagina from the vagina 

 proper. The clitoris lies along the floor of the former. About half way forward to 

 the point of divergence of the uterine horns is a second internal fold in the walls of 

 the vagina. The dorsal part of this fold forms a thick pad-like thickening on the 



