Which bone is known as the hip bone and is formed by the fusion of ilium, ischium, and pubis?

The hip bone is commonly referred to as the os coxae, which is formed by the fusion of three individual bones: the ilium, ischium, and pubis. This terminology is important in anatomy, as the os coxae serves as a key structure in the pelvic region, providing support for the trunk and functioning in locomotion and weight-bearing activities. Each of the three components contributes to the overall shape and function of the hip bone, allowing for the attachment of various muscles and ligaments that play crucial roles in movement and stability.

While terms like "pelvis" and "coxal bone" may be used in related contexts, they do not specifically denote the fused structure of the ilium, ischium, and pubis. The pelvis refers more broadly to the whole bony structure that includes the os coxae as well as other elements such as the sacrum and coccyx, while coxal bone is sometimes used interchangeably with os coxae but is less formal in anatomical language. Thus, the os coxae is the precise term to describe the hip bone in this context.