Expansion
Flexes the elbow and is the most powerful supinator of the forearm
Expansion
- Supination of the forearm - its most powerful action, especially with the elbow flexed
- Flexion of the elbow
- Weak flexion of the shoulder
Supplied by the musculocutaneous nerve (C5 to C6). The long head arises from the supraglenoid tubercle of the scapula.