264 THE VISCERA. 
Ventrad of the external orifice of the urogenital sinus is the 
clitoris, a rudimentary structure homologous with the penis of 
the male. 
The Ovaries (c).—The ovaries lie in the abdominal cavity 
in the same longitudinal line with the kidneys and a short dis-_ 
tance caudad of them. Each is an ovoid body about one centi- 
meter long and one-third to one-half as broad. On its surface 
are numerous whitish projecting vesicles, the larger of which 
show clear centres. They are the Graafian follicles (best seen 
in section), which contain the eggs. There may be present 
one or more elevations of the size of the largest Graafian folli- 
cles, but of a bright red or brown color., They are the corpora 
lutea (sing. corpus luteum),—Graafian follicles from which the 
eggs have been discharged. 
The ovary is held in position by the broad ligament of the 
uterus, a fold of the peritoneum, which passes here from the 
uterine tube to the adjacent body wall. The ovary lies in a 
sort of a pocket formed by the broad ligament. In the natural 
position the pocket opens ventrolaterad. The ovary is further 
held in position by the ligament of the ovary (ligamentum 
ovarii), a short thick cord which passes from the ventral face 
of the ovary at its uterine end to the adjacent ventral surface 
of the uterus. 
The Uterine Tubes (¢).—The uterine (or Fallopian) tubes 
or oviducts are the tubes which convey the ova from the ovary 
(c) to the uterus (7). Each begins with an expanded trumpet- 
shaped opening, the ostium tube abdominale (¢). Its walls 
are thin, and the mucosa of its inner surface is thrown up into 
undulating, radiating ridges. 
The ostium (@) lies on the lateral sidé of the ovary (c) at 
its cranial end, and the trumpet partly clasps the ovary. From 
the ostium the tube (¢) turns craniad, then mediad, and then 
caudad, so as to describe a curve about the cranial end of the 
ovary. It then extends caudad on the mediodorsal aspect of 
the ovary to its junction with the uterine cornu (/).  It’is 
sinuous throughout its course, and the first two-thirds (the 
vestibulum) is of considerably greater diameter than the last 
third. Throughout the last two-thirds of its course it lies in 
