Where exactly is the posterior fornix of the uterus located?

Generally, the posterior fornix of the uterus refers to the posterior vaginal fornix, which is located at the back of the junction between the vagina and the uterine cervix. A detailed explanation is as follows:

The posterior vaginal fornix is an important anatomical structure in the female pelvis. It refers to the lowest portion of the potential space between the uterus and the rectum. Situated at the posterior aspect of the junction between the vagina and the uterine cervix, the posterior vaginal fornix lies adjacent to the rectum. Within the anatomical structure of the female pelvis, the posterior vaginal fornix is in a relatively depressed area and represents the lowest point within the pelvic cavity. Therefore, it often becomes the site where fluids, such as blood or pus, accumulate within the pelvis. During gynecological examinations, physicians frequently palpate the posterior vaginal fornix to assess the condition within the pelvic cavity, such as the presence of fluid accumulation or masses.

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