The pelvis is a basin-shaped structure in the skeleton that connects the trunk and the legs, supporting the spine and protecting abdominal organs.
The pelvis is not a single bone but rather a composite structure consisting of several bones:
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The two hip bones (also known as coxal bones or innominate bones): Each hip bone is formed by the fusion of three bones:
- Ilium: The largest and uppermost of the three.
- Ischium: The lower and posterior part.
- Pubis: The anterior and inferior part.
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The sacrum: A triangular bone at the base of the spine, formed by the fusion of five vertebrae.
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The coccyx (tailbone): Located below the sacrum, it is formed by the fusion of several small vertebrae.
Anteriorly, the two hip bones connect at a joint called the pubic symphysis. Posteriorly, they articulate with the sacrum at the sacroiliac joints.
In summary, the pelvis, often referred to as the "pelvic bone," comprises the left and right hip bones (each made of the ilium, ischium, and pubis), the sacrum, and the coccyx.
