_The Uterus_ (_f_, _i_).--The =uterus= consists of a median portion or =body= (_i_) which is unpaired, and of two =horns= or =cornua= (_f_) which extend from the body to the uterine tubes. The body (_i_) of the uterus is a tube about four centimeters long which lies in the abdominal cavity, ventrad of the rectum and between it and the bladder. Its caudal end is at the level of the cranial border of the pubis. The cranial end of its cavity is divided by a median dorsoventral partition into lateral halves, while the cavity of its caudal portion is unpaired. The mucosa is thrown up into large longitudinal folds. At its caudal end the uterus projects into the vagina (_m_), so that when the vagina is opened the end of the uterus is seen projecting into it as a prominent papilla. The portion of the uterus thus enclosed by the vagina is the =cervix uteri= or =neck= of the uterus. Its free end is directed ventrocaudad, and a prominent ridge is continued from its caudodorsal side along the mid-dorsal wall of the vagina. The uterine cavity communicates with the vaginal cavity by a V-shaped opening, the =os uteri=, which looks ventrocaudad and has its apex directed cranioventrad. Each horn (_f_) of the uterus passes craniolaterad in a nearly straight course from the body (_i_) to the uterine tube (_e_). It narrows rapidly and becomes continuous with the tube. The mucosa is thrown into longitudinal folds.
_Ligaments of the Uterus._--=The Broad Ligament.=--The uterus is held in place principally by the broad ligaments. These are two folds of the peritoneum, each of which is attached to the whole length of one of the cornua and the adjacent part of the uterine tube and to the corresponding lateral surface of the body of the uterus. Each ligament ends craniad in a concave free border. Its attached border forms a curved line which begins laterad of the kidney and extends thence to the lateral ligament of the bladder. From the lateral ligament of the bladder the broad ligament extends caudad into the =rectovesical= pouch of the peritoneum, which lies between the rectum and the bladder. It holds the body of the uterus to the lateral wall of this pouch, and together with the opposite ligament and the body of the uterus forms thus a transverse partition, which divides the rectovesical pouch into dorsal and ventral portions.