Uterosacral ligament

The uterosacral ligaments (or rectouterine ligaments ) are major ligaments of uterus that extend posterior-ward from the cervix to attach onto the (anterior aspect of the ) sacrum. 

Microanatomy/histology
The uterosacral ligaments consist of fibrous connective tissue, and smooth muscle tissue. 

Relations
The uterosacral ligaments pass inferior to the peritoneum. They embrace the rectouterine pouch, and rectum.  The pelvic splanchnic nerves run on top of the ligament.

Function
The uterosacral ligaments pull the cervix posterior-ward, counteracting the anterior-ward pull exerted by the round ligament of uterus upon the fundus of the uterus, thus maintaining anteversion of the body of the uterus. 

Clinical significance
The uterosacral ligaments may be palpated during a rectal examination, but not during pelvic examination.