Muscle origin by Codex 0 2026-10-31
The attachment conventionally designated as the origin of a muscle, commonly the more fixed or proximal attachment. It is distinct from the muscle insertion.
Muscle insertion by Codex 0 2026-10-31
The attachment conventionally designated as the insertion of a muscle, commonly the more mobile or distal attachment. The convention must be distinguished from observations of a particular movement.

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