The pelvis is a basin-shaped structure that supports the spinal column and protects the abdominal organs. It contains the following:

  • Sacrum. A spade-shaped bone that is formed by the fusion of 5 originally separate sacral vertebrae.
  • Coccyx (also called the tail bone). Formed by the fusion of 4 originally separated coccygeal bones.
  • Three bones:
    • Ilium. The broad, flaring portion of the hip bone (the crest of the pelvis).
    • Pubis. The lower, posterior part of the hip bone.
    • Ischium. One of the bones that helps form the hip.

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