Coccyx
Os coccygis
SkeletalSkeletonPelvis
- What it is
- The tailbone: three to five small rudimentary vertebrae fused into a tapering, forward-curving triangle.
- Function
- Anchors the gluteus maximus, the anococcygeal ligament and pelvic-floor muscles.
- Size
- ≈ 40 mm long
- Clinical note
- It is the vestigial remnant of a tail; a fall on the buttocks can bruise or fracture it (coccydynia).