Which bones are fused to form the pelvis?

The pelvis is formed from three main bones: the ilium, ischium, and pubis. These three bones come together to create the acetabulum, which is the socket for the hip joint. Over time, in human development, these bones fuse together to form a single bony structure known as the innominate bone or hip bone on each side of the body.

The ilium is the largest part of the pelvis, the ischium forms the lower and back portion, and the pubis is located at the front. Their fusion provides stability, support, and protection for the pelvic organs, and serves as an attachment point for various muscles. This anatomical configuration is essential for functions such as walking, sitting, and birthing processes in females.

In the context of the other options, while the coccyx is indeed part of the pelvic area, it does not fuse with the hip bones to form the pelvis itself. Similarly, the femur is the thigh bone and is not one of the bones that contribute to the pelvic structure.