The lesser pelvis, also known as the true pelvis, is the lower part of the pelvic cavity. It is situated below the pelvic brim and is bounded by the pelvic bones, including the ilium, ischium, and pubis. This area contains important organs such as the bladder, rectum, and, in females, the uterus. The lesser pelvis plays a crucial role in childbirth, as it forms the birth canal through which a baby passes during delivery. Its shape and dimensions can vary between individuals, influencing the ease of labor. Understanding the lesser pelvis is important in fields like obstetrics and anatomy.