Anatomy
·Thorax & Spine
Cervical Vertebrae (Atlas & Axis)
⭐ PREMIUM
C1 (atlas) and C2 (axis) are atypical and allow the "yes/no" head movements — high-yield for their unique anatomy.
ATLAS (C1)
• No body, no spinous process; ring of anterior + posterior arches + two lateral masses.
• Atlanto-OCCIPITAL joint (C0–C1): nodding "YES".
AXIS (C2)
• Has the DENS (odontoid process) projecting up — the pivot.
• Atlanto-AXIAL joint (C1–C2): rotation "NO"; the dens is he…
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