Sacrum

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The sacrum is a large, triangular bone at the base of the spine. It is part of the pelvic girdle connecting the two hip bones. Read on to see pictures of the sacrum and to learn more about why you need a sacrum.

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Sacrum

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Sacrum - Anterior or Front View
Sacrum - Anterior or Front View

The name sacrum is based on the Latin word sacer or "sacred." The sacrum was consider a sacred bone because it protected the reproductive organs.

As can be seen in the figures on the right, the sacrum is somewhat triangular in shape. The upper part of the sacrum connects with the last lumbar vertebra at the base of the spine. On the left and right, the sacrum connects with the two hip bones of the pelvis. At the bottom of the sacrum is the coccyx or tailbone.

A primary role of the sacrum is in forming the back or posterior wall of the pelvis where it strengthens and stabilizes the pelvis.

Close Up of Sacrum - Anterior or Front View
Close Up of Sacrum - Anterior or Front View

The central part of the sacrum is curved outward towards the posterior or rear. This allows for more room in the pelvic cavity.

The sacrum is a slightly different shape in males and females. The female sacrum is shorter and wider than the male sacrum.

 

Books on the Sacrum

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Other links on the Sacrum

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