Pedicle Of The Axis, Anatomy

Description

Axis (C2) pedicle anatomy is centered on the stout bony bridge connecting the vertebral body to the posterior elements, positioned posterolateral to the body and anteromedial to the lamina. The dens (odontoid process) rises superiorly from the body in the midline, while the pedicle runs posteriorly toward the junction with the lamina and the articular pillar, framing the lateral margin of the vertebral canal. Laterally, the transverse process and its foramen transversarium lie adjacent, placing the pedicle’s lateral cortex near the vertebral artery groove, and superiorly and inferiorly the superior and inferior articular facets align with C1 and C3 to form the zygapophysial joints. Bone detail is the point. C2 is a frequent site of traumatic injury and a common target for posterior fixation, so appreciating the pedicle’s cortical boundaries and its relationship to the spinal canal and transverse foramen matters in a way that general cervical vertebra diagrams do not. Hangman’s fracture classically involves the pars interarticularis of C2, immediately posterior to the pedicle, and subtle differences between pedicle, pars, and lamina alter how you describe the fracture line and plan fixation. For surgeons planning C2 pedicle or pars screws, the close lateral relationship to the vertebral artery and the medial proximity to the dural sac make trajectory planning unforgiving, and a static 3D perspective helps learners keep those spatial constraints straight. Use this illustration for spine anatomy teaching in gross anatomy, neuroanatomy, and orthopedic or neurosurgical modules, and for figure support in publications discussing C2 instrumentation, cervical trauma classification, or vertebral artery risk corridors. It also fits radiology teaching when correlating CT of the second cervical vertebra with operative anatomy. Anatomical accuracy verified by SciePro's Medical Advisory Board.