What happened to the vertebrae at end of spine?

The vertebrae at the end of the spine are called the coccyx. The coccyx is made up of four small, fused vertebrae that form a triangular bone at the base of the spine. The coccyx is sometimes called the tailbone because it is a remnant of the tail that humans had in their evolutionary past.

The coccyx serves a few functions. It helps to support the pelvic organs and provides attachment points for muscles and ligaments. The coccyx also helps to protect the spinal cord and nerve roots from injury.

In some cases, the coccyx can become injured or diseased. This can cause pain, discomfort, and difficulty sitting. In some cases, surgery may be necessary to remove the coccyx.