Rate this video Both infraspinatus and teres minor cause external rotation of the humerus, so the best position to counterstrain these muscles is with the humerus in external rotation. Infraspinatus Infra (L). Below, beneath Spin, =a, -i (L). A spine, thorn Origin – Infraspinous fossa of scapula Insertion – Posterior humerus Action – External […]
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