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Movement is passive minor flexion and extension and the joint typically fuses with ageįive ligaments support the sacrococcygeal symphysis: Sacrococcygeal symphysis: a fibrocartilaginous joint that connects the apex of the sacrum to the coccyx. base: proximal oval surface for articulation with the sacrum.anteriorly to posteriorly, the lateral border serves as attachment for the coccygeus, sacrospinous ligament, sacrotuberous ligament, and fibers of the gluteus maximus.it is the largest eminence and the inferior eminences subsequently decrease in size.the most superior eminences join the lateral edges of the sacrum, forming the foramen for the transmission of the anterior division of the fifth sacral nerve.thin with several eminences that represent rudimentary transverse processes of the coccygeal vertebrae.the coccygeal and sacral cornua combine to form the foramen for the transmission of the posterior division of the fifth sacral nerve.the superior pair are the largest and are called the coccygeal cornua.there is a vertical row of tubercles on either side, which are rudimentary articular processes of the coccygeal vertebrae.convex, similarly marked with three transverse grooves.anterior surface: concave, marked with three transverse grooves representing the fusions of the four separate vertebrae.The coccyx consists of an anterior and posterior surface, two lateral surfaces, an apex and a base. Structure of the coccygeal vertebral junctions is variable and age-related, ranging from fully developed to rudimentary intervertebral discs with varying degrees of cystic or fibrotic change, to fusion of the vertebrae in the later decades. The first segment is the largest, and the subsequent are smaller in size. The coccyx is formed from four rudimentary vertebrae and does not contain a spinal canal, pedicles, laminae or spinous processes. Clearly "C" is already used for the cervical vertebrae.

For the purposes of numbering the vertebral segments, and stipulated by the Terminologia Anatomica (TA), "Co" is used as the abbreviation for each coccygeal level, e.g.