Final answer:
The large, oval-shaped pelvic outlet is the inferior opening of the female bony pelvis, larger than the male's to facilitate childbirth, and defined by several bony landmarks.
Step-by-step explanation:
The female pelvic outlet is part of the bony pelvis structure. This large opening at the inferior aspect of the pelvis, which is oval in shape, serves as the exit for the birth canal during childbirth. The pelvic outlet is defined by several bony landmarks which include the inferior margin of the pubic symphysis anteriorly, and the ischiopubic ramus, the ischial tuberosity, the sacrotuberous ligament, and the tip of the coccyx posteriorly. It is larger and more oval in females as compared to males, due to evolutionary adaptations favoring successful childbirth.
The superior region, called the greater pelvis, and the inferior, more rounded space of the lesser pelvis, are separated by the pelvic brim (pelvic inlet).