What is the tailbone called?
The tailbone is called the coccyx. Gray's Anatomy (1918) describes it as a small, triangular bone formed by the fusion of the last three to five vertebrae.
What it is
- A small, triangular bone formed by the fusion of the last three to five vertebrae.
- The vestige of the tail in humans.
- Provides attachment for several pelvic muscles and ligaments.
Where it is
- At the very bottom of the vertebral column.
- Just below the sacrum.
- Between the buttocks.
Source:
Last verified: 2026-07-18
- Best Anatomy Answers is an educational reference about human anatomy. It is not medical advice — for any health concern, talk to a licensed medical professional.