In the medical field, the term "apertura pelvis inferior" refers to the lower opening of the pelvis. However, there are several synonymous terms used to describe this anatomical feature. One alternative phrase is "inferior pelvic opening", which highlights the location and purpose of this specific bodily structure. Another synonym for "apertura pelvis inferior" is "pelvic outlet", as it represents the area where the baby passes through during childbirth. Additionally, it can also be referred to as the "inferior pelvic aperture" or simply the "pelvic floor opening". These synonyms are vital in medical discussions or when communicating complex anatomical information in a more accessible manner.