What is the tailbone called?

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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.

Summary

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.

Sources

According to Gray's Anatomy of the Human Body (1918, public domain):

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