Description
The first coccygeal vertebra (Co1) is the largest and most superior of the four coccygeal vertebrae. It consists of the base of coccyx, two coccygeal cornua, and two transverse processes. However, it has no spinous process, pedicles or laminae.
The first coccygeal vertebra articulates with the sacrum superiorly, forming the sacrococcygeal joint, while it fuses with the second coccygeal vertebra inferiorly.
Related parts of the anatomy
