Interarticularis Of Axis's Vertebral Arch, Superior View

Description

Axis (C2) pars interarticularis is highlighted from a superior perspective, positioned between the superior articular facet laterally and the posterior elements of the vertebral arch. From this fixed viewpoint, the pars forms the bony bridge at the junction of pedicle and lamina, bordering the vertebral foramen medially while the superior articular surfaces sit posterolaterally, oriented to receive the inferior articular facets of the atlas (C1). Posterior midline landmarks of the neural arch, including the base of the spinous process and adjacent laminae, frame the pars on either side. A small, unforgiving corridor. Clinically, the C2 pars interarticularis is the key fracture site in traumatic spondylolisthesis of the axis (hangman’s fracture), where bilateral defects can permit anterior translation of the C2 body on C3 and threaten stability at the upper cervical spine. That makes the superior view practical for correlating surface anatomy with CT anatomy, since pars fracture lines and screw trajectories are often interpreted relative to the superior articular facets, spinal canal margin, and the posterior arch. The lighting and bony relief in this image help separate the pars from the adjacent superior articular facet, a distinction that matters when planning C2 pars or pedicle fixation and when explaining why “C2 spondylolysis” differs from facet fractures. Use this illustration in gross anatomy and osteology teaching for cervical vertebrae, in radiology education to pair with axial and sagittal CT reconstructions of C2, or in spine surgery publications discussing posterior C2 fixation options and upper cervical trauma classification. It also suits patient-facing materials when you need a single, precise bony landmark to explain a hangman’s fracture without soft-tissue distraction. Anatomical accuracy verified by SciePro's Medical Advisory Board.