1 — Axis [CII]; 2 — Lateral atlanto-axial joint; 3 — Atlas [CI]; 4 — Atlanto-occipital joint; 5 — Occipital bone, lateral part; 6 — Occipital bone, basilar part; 7 — Anterior atlanto-occipital membrane; 8 — Joint capsule; Articular capsule; 9 — Posterior longitudinal ligament; 10 — Intervertebral disc; 11 — Cervical vertebrae [CIII], vertebral body; 12 — Axis [CII], vertebral arch; 13 — Atlas [CI], lateral mass; 14 — Occipital bone; 15 — Posterior atlanto-occipital membrane; 16 — Lateral atlanto-occipital ligament; 17 — Lateral atlanto-axial joint; Joint capsule; Articular capsule; 18 — Posterior tubercle
