The tailbone is which bone?

The tailbone is which bone?

• A. Pelvis
• B. Ilium
• C. Coccyx
• D. Ischium

Answer: (C)

The tailbone is the coccyx. It’s the small bone at the very end of the vertebral column, sitting beneath the sacrum and forming part of the tail end of the skeleton. It’s not one of the pelvic bones—the ilium (the wide, flaring part), the ischium (the sit-bone), or the pubis—though those bones together with the sacrum form the pelvic ring. The coccyx, sometimes called the tailbone, is made of fused small vertebrae and articulates with the sacrum at the sacrococcygeal joint. This distinction explains why the coccyx is the correct answer rather than any of the other pelvic bones.

The tailbone is the coccyx. It’s the small bone at the very end of the vertebral column, sitting beneath the sacrum and forming part of the tail end of the skeleton. It’s not one of the pelvic bones—the ilium (the wide, flaring part), the ischium (the sit-bone), or the pubis—though those bones together with the sacrum form the pelvic ring. The coccyx, sometimes called the tailbone, is made of fused small vertebrae and articulates with the sacrum at the sacrococcygeal joint. This distinction explains why the coccyx is the correct answer rather than any of the other pelvic bones.