Coccyx

Coccyx, Coccygeal vertebrae, Anterior view, Spine, Vertebral column, Human skeleton
Coccyx by Anatomy Next

The coccyx (Latin: os coccygis), also known as the tailbone, is the final part of the vertebral column consisting of three to five rudimentary vertebrae. It is located below the sacrum, and both bones are connected by the sacrococcygeal symphysis.

The coccyx of an adult usually presents as a single bone formed by three, four or five fused vertebrae that lack the vertebral arches. However, the appearance and size of the coccyx vary, and it may consist of two to five separate bony segments.

Coccyx, Tailbone, Coccygeal vertebrae, Anterior view, Landmarks, Vertebra, Spine, Vertebral column, Human skeleton
Anterior view of coccyx by Anatomy Next

The coccyx is a triangular-shaped bone with its base facing the sacrum while its apex is facing downward. Each side of the base contains a coccygeal cornu (horn) - a rudimentary superior articular process projecting upward from the base. The base of the coccyx presents with one articular facet. Also, the first coccygeal vertebra has two transverse processes.

Coccyx, Tailbone, Coccygeal vertebrae, Posterior view, Landmarks, Vertebra, Spine, Vertebral column, Human skeleton
Posterior view of coccyx by Anatomy Next