C2 Vertebra or Axis, Lateral View

Description

Arising superiorly from the C2 vertebral body, the dens (odontoid process) occupies the anterior half of the axis and sits just posterior to the anterior arch of the atlas (C1) in this lateral cervical spine view. Posterior to the dens, the C2 vertebral canal opens beneath the posterior arch of C1, while the C2 spinous process projects posteriorly and inferiorly, longer than the atlas’ rudimentary posterior tubercle. The superior and inferior articular facets of C2 are oriented to meet C1 above and C3 below, and the transverse processes extend laterally with the transverse foramina aligned along the cervical column. Clinical attention centers on the atlantoaxial complex because rotation of the head occurs primarily around the dens, and small changes in alignment can threaten the upper cervical spinal cord. Odontoid fractures (classically Anderson and D’Alonzo types II and III) and atlantoaxial instability in rheumatoid arthritis or Down syndrome are evaluated by dens position and the atlantodental interval, and this lateral perspective clarifies why posteriorly displaced dens fragments can narrow the canal. A surgical landmark. Use this artwork for teaching cervical spine osteology in gross anatomy, radiographic anatomy, and orthopaedic or neurosurgical modules covering C1 to C2 biomechanics, trauma patterns, and preoperative planning for odontoid screw fixation versus posterior C1 to C2 fusion. It also fits textbooks and patient education materials explaining whiplash-associated upper cervical pain and the rationale for immobilization when a dens injury is suspected. Anatomical accuracy verified by SciePro's Medical Advisory Board.