Final answer:
The superior part of the hip bone is the ilium, which is part of the pelvic girdle along with the ischium and pubis. Altogether, these bones support the body's weight and facilitate locomotion.
Step-by-step explanation:
The superior part of the hip bone is formed by the ilium. The hip bone, also known as the coxal bone, plays a significant role in the pelvic girdle, where it attaches the lower limbs to the axial skeleton. In adults, the hip bone consists of three fused bones: the ilium, ischium, and pubis. The ilium forms the uppermost and largest portion, the ischium forms the lower and back part, and the pubis forms the lower and front part of the hip bone. The ilium, ischium, and pubis converge and articulate at the joint known as the pubic symphysis. Posteriorly, the hip bone articulates with the sacrum at the sacroiliac joint, and together with the coccyx, constitutes the complete pelvis.
In conclusion, the hip bone's uppermost part is the ilium, responsible for supporting the body's weight, providing an attachment for muscles, and playing a critical role in locomotion. The pelvic girdle, formed by the strong and complex assembly of the hip bones, sacrum, and coccyx, provides stability and support to the human body, particularly during movement.