Final answer:
The hip bone, or coxal bone, contributes to the pelvis and is composed of the fused ilium, ischium, and pubis. These bones fuse during late teenage years and attach to the axial skeleton at the sacrum and to each other at the pubic symphysis. The sacrum and coccyx also derive from the fusion of vertebrae.
Step-by-step explanation:
The adult hip bone, also known as the coxal bone, plays a crucial role in forming the pelvic girdle of the pelvis. It is a large, curved bone that contributes to the lateral and anterior aspects of the pelvis. During the late teenage years, three individual bones – the ilium, ischium, and pubis – fuse to create each adult hip bone.
These bones are attached together via strong ligaments to the axial skeleton at the sacrum, and anteriorly to each other at the pubic symphysis. These regions retain their names and define the areas of the adult hip bone.
During childhood and adolescence, growing layers of cartilage form synchondroses that connect the ilium, ischium, and pubis. Once growth concludes, this cartilage is replaced by bone becoming synostoses, which fuse these components into one singular, mature coxal bone. In addition, the bones of the sacrum and the coccyx result from the fusion of sacral and coccygeal vertebrae, supporting the structure of the pelvis.