Retraction is the anatomical term of motion for posterior movement of the arms at the shoulders
It is the opposite of protraction.
Major muscles involved include:
cartilaginous: Synchondrosis - Symphysis
synovial: Plane joint - 1° (Hinge joint, Pivot joint) - 2° (Condyloid joint, Saddle joint) - 3° (Ball and socket joint)
specialized/upper limbs: Protraction/Retraction - Supination/Pronation
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