Which of the following is not a function of pelvic bones?

The pelvic bones are a group of bones in the lower torso that form the pelvis, which serves as a supporting structure for the spine and legs. 

The pelvic bones support the pelvic floor, a group of muscles and connective tissues that aid in bladder and bowel control, sexual function, and pelvic stability. The pelvic bones also connect other structures to the pelvis, such as the legs, via the hip joints, and form the pelvic ring by connecting the hip bones to the sacrum, a large triangular bone at the base of the spine.

The skull protects the delicate brain by providing a bony and sturdy casing.