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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.
There are two teres muscles. The other one is the teres major muscle, a thick, flattened muscle that brings the arm toward the body and assists in extending it when the arm is in a flexed position.The teres major muscle also aids in rotating the arm but its function is just the opposite of the teres minor and other ...Click to read more below. The teres minor muscle rotates the arm laterally and assists in bringing it toward the body.As it draws the upper arm bone (humerus) up, it strengthens the shoulder joint.he teres major muscle also aids in rotating the arm but its function is just the opposite of the teres minor and other ... Click to read more below. The teres minor muscle rotates the arm laterally and assists in bringing it toward the body.