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Explain how the pectoralis major can have concentric actions of both abduction and adduction of the...

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Medical Sciences

Explain how the pectoralis major can have concentric actions ofboth abduction and adduction of the glenohumeral joint. Provide anexample movement to demonstrate your understanding.

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Ans Pectoralis major The pectoralis major has four actions which are primarily responsible for movement of the shoulder jointThe first action is flexion of the humerus as in throwing a ball underhand and in lifting a child Secondly it adducts the humerus as when flapping the arms Thirdly it rotates the humerus medially as occurs when armwrestling Fourthly the pectoralis major is    See Answer
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