The coccyx is a small bone at the base of the spine. 尾骨是脊骨底部的一块小骨。
It can be described as the master sphincter of the entire pelvic area, and it runs from the pubic bone in the front all the way to the coccyx, or end of the spine, in the back. 可以说这块肌肉是整个骨盆区的主要括约肌，它从前方的耻骨一直延伸到尾骨，或向后方终止于脊柱。
