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Hip bone
The hip bone (innominate bone, pelvic bone〔Merriam Webster, http://www.merriam-webster.com/medical/hip+bone〕 or coxal bone) is a large flat bone, constricted in the center and expanded above and below. In some vertebrates (including humans before puberty) it is composed of three bones: the ilium, ischium, and the pubis.
The two hip bones join at the pubic symphysis and together with the sacrum and coccyx (the pelvic part of the spine) comprise the skeletal component of the pelvis – the pelvic girdle which surrounds the pelvic cavity. They are connected to the sacrum, which is part of the axial skeleton, at the sacroiliac joint. Each hip bone is connected to the corresponding femur (thigh bone) (forming the primary connection between the bones of the lower limb and the axial skeleton) through the large ball and socket joint of the hip.
==Structure==
The hip bone is formed by three bones: ilium, ischium, and pubis. At birth, these three component bones are separated by hyaline cartilage. They join each other in a Y-shaped portion of cartilage in the acetabulum. By the end of puberty the three bones will have fused together, and by the age of 25 they will have ossified.
The two hip bones join each other at the pubic symphysis. Together with the sacrum and coccyx, the hip bones form the pelvis.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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