Coccyx
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A coccyx with four vertebrae.
The coccyx is a set of bones that are fused together (joined up). It is found at the base of the vertebral column. This collection of bones is often called the tailbone. At birth, these bones are separate. These bones do not contain cartilage between them.
Coccyx Media
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A coccyx with four vertebrae below the sacrum
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The coccyx sits below the sacrum and behind the pelvic cavity.