Pelvis (or Os Coxa) The pelvis is a ring of bones in the lower trunk of the body, which is bounded by the coccyx (tail bone) and the hip bones. The pelvis protects abdominal organs such as the bladder, rectum and, in women, the uterus. The pelvis is made up of three hip bones, which are joined by rigid sacroilac joints to the sacrum at the back. The hip bones curve forward to join the pubic symphysis at the front. The symphysis pubis is a cartilaginous union between both sides of the pelvis anteriorly. It is significant during childbirth as it is capable of stretching to permit delivery. Attached to the pelvis are muscles of the abdominal wall, the buttocks, the lower back, and the insides and backs of the thighs. Each innominate bone is made up of three fused bones: the ilium, the ischium, and the pubis. Together they form the acetabulum which is a cup-like depression ball and socket joint. The ilium is the uppermost and largest and consists of a wide, flattened plate with a long curved ridge (called the "iliac crest") along its border. The pubis is the smallest
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