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Anatomical points. Basion (Ba): Point located in the lower portion on the anterior margin of the foramen magnum; C2 (Second cervical vertebra): Lower anterior point of the C2 vertebra; Posterior Nasal Spine (PNS): Tip of the posterior nasal spine of the palatine bone at the junction of the soft and hard palate; Hyoid (H): Uppermost point of the Hyoid bone.
