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What is the posterior deltoid muscle?

Located on the rear part of the shoulder, the posterior deltoid muscle runs from the insertion of the trapezius to the top of the upper arm (humerus). It helps externally rotate the upper arm (humerus) and pull the arm back.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.