7 - Supplement

7 - Supplement - X in the box means that the muscle is...

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“X” in the box means that the muscle is responsible for that action Kinesiology “*” in the box and small print means those are notes about the muscle/movement OT 440 Muscles of Elbow & Forearm Flexion Extens ion Abduction Adduction Pronation Supination Biceps Brachii *active in all flexion activities when forearm is supinated * biceps & supinator form a force couple *is a prime mover with resistance X -(simulataneously with supination unless hand is fixed (doing a pull up harder with forearm supinated) or neutralizing actions of muscles occur, ie pronators) *when forearm is pronated, biceps is active only against resistance *when forearm is pronated, biceps is active only against resistance X- prime mover (simultaneously with flexion unless handi s fixed or neutralizing actions of muscles occur) *most effective at supination when elbow is flexed to 90 degrees *ineffective in supination with full extension or full flexion b/c of active insufficiency *strongest supinator; wraps around radius when forearm
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