Abstract
1. In ten healthy young men an experimental paralysis of the supraspinatus muscle was induced with the aid of Xylocaine injected in or near the suprascapular nerve.
2. The completeness of the paralysis was checked by electromyography.
3. With the supraspinatus muscle completely eliminated, all subjects could move the arm against gravity through its full range in the shoulder joint, though the force and the power of endurance during abduction were diminished.
4. It is concluded that the role of the supraspinatus muscle is of a quantitative nature only.
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