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Why can't the deltoid initiate abduction of the shoulder when the arm is by the side?
Wiki User
∙ 10y ago
When the arm is fully adducted, the line of pull of the deltoid coincides with the axis of the humerus; thus, it pulls directly upward on the bone and cannot initiate or produce abduction. This is why it requires assistance from the supraspinatis muscle to initiate abduction.
From Clinically Oriented Anatomy, Seventh Edition, by Keith L. Moore, Arthur F. Dalley, and Anne M.R. Agur
Wiki User
∙ 10y ago
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