All of the following structures are normally palpable upon vaginal examination Except the:

Normally, the sacral promontory is too distant to be palpable on vaginal examination. If the sacral promontory is palpable, this indicates that the conjugate diameter of the pelvis is smaller than normal, and a normal vaginal delivery may not be possible. The ischial spines are palpable. This landmark is used for administering a pudendal nerve block. The pudendal nerve wraps around the ischial spine and sacrospinous ligament. The rectouterine pouch is palpable through the wall of the posterior fornix of the vagina. The ovary and uterine tubes are palpable in the broad ligament.