Posterior Tubercle Of Atlas Of Atlas, Superior View

Description

Posterior tubercle of the atlas (C1) anchors the midline of the posterior arch in a superior view, sitting posterior to the vertebral foramen and medial to the paired lateral masses. From this fixed perspective, the posterior arch sweeps laterally on both sides, where its superior surface transitions toward the sulcus for the vertebral artery before reaching the transverse process and transverse foramen. Articular facets on the superior surface of the lateral masses for the occipital condyles lie anterolateral to the tubercle, framing the craniovertebral junction. Midline anatomy, no distraction. For teaching upper cervical topography, the posterior tubercle is a dependable landmark: it marks the attachment of rectus capitis posterior minor and the ligamentum nuchae, and it helps orient the surgeon to the posterior ring during exposure for C1 laminectomy or posterior arch work. Its relationship to the vertebral artery groove matters when planning instrumentation near the lateral mass and posterior arch, where a few millimeters of error can place the artery at risk. The superior viewpoint makes it easier to appreciate how the arch forms the posterior boundary of the spinal canal at C1, a key reference when discussing Jefferson fractures and isolated posterior arch fractures after hyperextension trauma. Use this illustration in gross anatomy and spine modules covering the craniovertebral junction, and in operative atlases or device manuals that describe C1 posterior elements and screw trajectory planning relative to the vertebral artery. It also supports pain and headache education when correlating suboccipital muscle attachments at the posterior tubercle with cervicogenic headache patterns. Anatomical accuracy verified by SciePro's Medical Advisory Board.