Deltoid is the prime mover for lifting the arm out to the side, helped at the start by supraspinatus.
GlossaryanatomyDraft
Prime mover
The muscle that produces most of the force for a movement; often used to mean the agonist.
The muscle that produces most of the force for a movement; often used to mean the agonist.
Deltoid is the prime mover for lifting the arm out to the side, helped at the start by supraspinatus.