Inferior Articular Facet Of The Axis, Anatomy

Description

Axis (C2) inferior articular facet is highlighted on a lateral view of the cervical vertebra, with the lamina forming a flattened bony plate that slopes posteriorly toward the bifid spinous process. The inferior articular surface sits posterior to the vertebral body and inferior to the superior articular facet, positioned to meet the superior articular facet of C3 at the C2–C3 zygapophysial joint. Posterior elements dominate the frame, so the junction of lamina and spinous process reads as a continuous arch, while the articular region projects laterally from the vertebral arch. Orientation is unambiguous. That inferior facet matters because it is one of the load-bearing contact points that guides cervical extension and rotation while constraining translation at C2–C3, and it becomes a frequent pain generator in cervical facet arthropathy and post-traumatic malalignment. The lateral emphasis helps when teaching how the lamina supports the articular processes, and why posterior element fractures and pars interarticularis disruptions can alter facet congruity even when the vertebral body appears intact on plain films. In hangman’s fracture patterns (traumatic spondylolisthesis of C2), the relationship between the posterior arch and the articular complex is the anatomic substrate for instability at C2–C3 and for selecting posterior fixation versus anterior C2–C3 fusion. Use this illustration in gross anatomy and musculoskeletal modules to anchor terminology for the axis, lamina, spinous process, and articular facets, and in spine surgery or neuroradiology teaching files when correlating CT bone windows with posterior element landmarks. It also fits well in chapters on cervical zygapophysial joint injections and medial branch blocks, where accurate facet orientation underpins safe needle planning and interpretation of referred pain patterns. Anatomical accuracy verified by SciePro's Medical Advisory Board.