The brachioradialis is the upper outer region of the forearm. This muscle is responsible for turning the forearm up and down (supination and pronation).
The wrist extensors is a group of 8 muscles responsible for extension of the hands and fingers from the wrist joint.
The wrist flexors is a group of 6 muscles that is responsible for flexion, adduction and abduction of the wrist and fingers.
The pronator teres and pronator quadrates are responsible for pronation of the hand and elbow flexion.
The supinator muscle is a broad muscle in the forearm which assits in supinating the hand (turning up the hand)