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Axial Skeleton

Axial Skeleton - referring to the bones of the head, neck, trunk and spinal column (does not include pelvis). There are approximately 80 bones in the axial skeleton.
  • Etymology - Axial, as in "axis", referring to "imaginary motionless straight line around which a body (such as the Earth) rotates," from Latin axis "axle, pivot, axis of the earth or sky" - Etymology Online
"Axial skeleton" is a label referring to a set of bones whose function is distinct from the bones of the "appendicular skeleton".