Pars Interarticularis Of The Cervical Vertebra, Posterior View

Description

Pars interarticularis (the cervical articular pillar) is centered in this posterior view of a cervical vertebra, bridging the superior articular process above to the inferior articular process below. Lateral to the midline spinous process and lamina, the pillar forms the bony column that frames the posterior aspect of the zygapophysial (facet) joint, with the facet surfaces angled in an oblique plane relative to the sagittal midline. Inferiorly and medially, the lamina converge toward the base of the spinous process, while the lateral mass region thickens toward the transverse process, establishing the corridor surgeons reference when discussing the posterior elements of the subaxial cervical spine. Cervical pars anatomy matters because it is a common site for stress injury and fracture, and it is a defining landmark for posterior fixation strategies. At C2, the pars region corresponds to the isthmus vulnerable in traumatic spondylolisthesis (Hangman’s fracture), while in the subaxial spine the articular pillar is scrutinized when evaluating facet fractures, perched facets, and degenerative hypertrophy that can narrow the neural foramina. The posterior perspective clarifies how the pillar sits between the facet joints and adjacent lamina, a relationship that governs safe trajectories for lateral mass screws and helps explain why malposition risks violating the facet joint or the vertebral artery canal more laterally. Use this illustration in cervical spine modules for gross anatomy, orthopaedic surgery, and neurosurgical training when teaching posterior bony landmarks, facet joint orientation, and the terminology of the pars interarticularis versus lateral mass. It also suits figure plates for clinical texts on cervical trauma classification, posterior instrumentation, and CT correlation of articular pillar fractures. Anatomical accuracy verified by SciePro's Medical Advisory Board.