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Pronator teres. The pronator teres muscle is located on the palmar side of the forearm, below the elbow. Aided by the pronator quadratus, its function is to rotate the forearm palm-down. This is also known as pronation. The pronator teres muscle has two heads: the humeral head and the ulnar head. As the names imply, they connect the ends of the humerus and the ulna to the radius.
What pain and symptoms are associated with the teres major muscle? Pain in the back of the upper arm when reaching forward and up. Sharp pain in the back of the shoulder with aching sensation in the upper arm when resting elbows on a table. Pain in the back of the arm that skips the elbow and continues down to the back of the forearm.