Forearm

Flexion
Prime movers:  Biceps brachii & Brachialis

(Musculocutaneous nerve) Musculocutaneous nerve injury

Assisting:

Brachioradialis  (Radial nerve) Radial nerve injury

Pronator teres (Median nerve) Median nerve injury

Flexor carpi radialis (Median nerve) Median nerve injury

Flexor carpi ulnaris (Ulnar nerve) Ulnar nerve injury

Flexor digitorum superficialis (Median nerve) Median nerve injury

Palmaris longus (Median nerve) Median nerve injury

 Extension 

Primer mover: Triceps brachii

Assisting:

Anconeus

Extensor carpi radialis longus

Extensor carpi radialis brevis

Extensor digitorum

Extensor carpi ulnaris

Supinator

(Radial nerve) Radial nerve injury

 Supination 

Prime movers: Biceps brachii (most effective) & Supinator

Assisting: Brachioradialis

Biceps brachii (Musculocutaneous nerve) Musculocutaneous nerve injury

Supinator (Radial nerve) Radial nerve injury

Brachioradialis (Radial nerve) Radial nerve injury

Pronation

Prime movers: Pronator quadratus

Assisting: Pronator teres & Flexor carpi radialis

(Ulnar nerve) Ulnar nerve injury