Posterior Arch of Atlas Anatomy in 3D

The back-ring of C1. It has a groove for the Vertebral Artery; a fracture of this arch is a "Skull-Neck" injury that requires the patient to wear a "Halo" brace for months.

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Related structures

Posterior Tubercle of Atlas Anterior Arch of Atlas Posterior Articular Facet of Dens Axis Posterior Border of Fibula Posterior Border of Radius Posterior Border of Ulna Posterior Limb of Stapes Posterior Process of Talus