How would range and strength of abduction of the upper extremity be affected if there were paralysis of the deltoid muscle?
What will be an ideal response?
ANS:
The supraspinatus could replace the force of the deltoid in abduction, although the motion would be weak. That is, one could abduct fully (or nearly so depending on the strength of the muscle), but the muscle could not take any significant resistance. Flexion could be accomplished by the coracobrachialis, the clavicular portion of the pectoralis major, and the long head of the biceps. Some weakness would be evident.
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