Human tail degradation in the external no, but left behind the tail bone, tail bone number varies, tail vertebrae are usually connected by three to four small bones, and the sacrum constitutes the sacral and caudal joints, the tail bone is also between the tail bone of the intercaudal joint.
The coccyx is located below the sacrum, the most caudal part of the spine, the last of the vertebrae, and the last one is felt all the way down the spine.