What is the posterior deltoid muscle?
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Dr. Mike Clark answered: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.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. More
