Each joint action, with the role and emphasis the graph assigns each muscle. These are qualitative anatomical labels, not measured muscle activation.
Shoulder adductionprimary action
Latissimus dorsi (prime mover, high emphasis); Teres major (synergist, high emphasis); Posterior deltoid (synergist, moderate emphasis); Pectoralis major (synergist, low emphasis)
Shoulder extensionsecondary action
Latissimus dorsi (synergist, moderate emphasis); Teres major (synergist, low emphasis)
Elbow flexionsecondary action
Brachialis (synergist, high emphasis); Brachioradialis (synergist, moderate emphasis); Biceps brachii (synergist, moderate emphasis)
Scapula depressionsecondary action
Trapezius (prime mover, moderate emphasis); Pectoralis minor (synergist, low emphasis)
Scapula downward rotationsecondary action
Rhomboids (synergist, low emphasis); Pectoralis minor (synergist, low emphasis); Trapezius (synergist, low emphasis)