Superior Articular Process Of Axis, Lateral View

Description

Axis (C2) superior articular process occupies the cranial aspect of the vertebra, carrying a smooth, convex superior articular facet that faces superolaterally to meet the inferior articular facet of the atlas (C1). In lateral view, the facet sits posterior to the vertebral body and dens (odontoid process), and superior to the C2 pedicle and lamina, with the spinous process extending posteriorly beyond the articular pillar. The articular surface contour and its margin are emphasized, while adjacent cortical landmarks, including the superior aspect of the transverse process and the posterior arch elements, provide orientation in the sagittal plane. Small details matter here. Clinical relevance centers on the atlantoaxial complex, where subtle changes in facet congruence and orientation influence stability and coupled rotation. Trauma and inflammatory disease can disrupt this joint: rheumatoid arthritis may produce atlantoaxial subluxation, and high-energy injury can involve C2 elements near the articular pillar, altering the relationship between C1 lateral mass and the C2 superior facet. For posterior C1 to C2 fixation planning (for example, transarticular screws or C2 pars/pedicle screw trajectories), the lateral profile of the superior articular process helps you appreciate where the joint surface lies relative to the pedicle, lamina, and the posterior elements without losing the bony context. Use this illustration in cervical spine anatomy labs, osteology teaching sets, and radiology correlation modules when students need a bone-based reference for the atlantoaxial facet as seen on lateral radiographs or sagittal CT reconstructions. It also fits operative technique manuals and spine surgery presentations discussing C1 to C2 arthrodesis landmarks and atlantoaxial instability. Anatomical accuracy verified by SciePro's Medical Advisory Board.