Final answer:
The pelvic outlet is broader in females with a larger subpubic angle and greater sciatic notch to accommodate childbirth, while the male pelvic outlet is smaller and structured for a stronger build. The differences in the pelvic outlet shape between males and females is key for skeletal sex determination.
Step-by-step explanation:
The question pertains to the anatomical differences between the male and female pelvis, specifically the position of the tube for the pelvic outlet. The pelvic outlet is the inferior opening of the pelvis, and its shape and dimensions differ significantly between males and females due to evolutionary adaptations for childbirth in females.
In females, the pelvis has evolved to be broader with a larger subpubic angle and a larger greater sciatic notch to facilitate the birthing process. The female pelvic inlet or brim is more rounded or oval, and the lesser pelvic cavity is wider and shallower than the male's. On the other hand, the male pelvis is generally thicker and heavier, with a heart-shaped inlet and a more narrow and deeper lesser pelvic cavity.
These structural differences also reflect in the shape of the pelvic outlet, which is rounded and larger in females, facilitating childbirth, while the male's pelvic outlet is shaped and sized to accommodate a smaller, stronger bone structure. The pelvic outlet shape is therefore one of the key elements in sex determination of skeletal remains.