Which of the following is NOT a segment of the pelvic bone?

The coccyx is not considered a segment of the pelvic bone. The coccyx, commonly referred to as the tailbone, is actually a small, triangular bone located at the distal end of the vertebral column. It is comprised of several fused vertebrae and serves as an attachment point for various muscles, ligaments, and tendons.

In contrast, the iliac, ischium, and pubis are the three primary components that make up the pelvic bone, which together form the pelvic girdle. The ilium is the largest part of the pelvis, forming the uppermost section. The ischium constitutes the lower and back part of the pelvis, while the pubis forms the front portion. Understanding the distinct roles and locations of these bones within the pelvis is crucial for comprehending human anatomy, particularly in relation to movement and the alignment in practices like Pilates.