Nerve
Musculocutaneous nerve
Anterior arm and lateral forearm skin
High-yield
Pierces coracobrachialis; supplies BBC (Biceps, Brachialis, Coracobrachialis). Injury weakens elbow flexion and supination.
Overview
A terminal branch of the lateral cord that supplies the anterior arm flexors and continues as the lateral cutaneous nerve of the forearm.
Reference facts
- Roots
C5, C6, C7 (lateral cord)
- Course
Pierces coracobrachialis, runs between biceps brachii and brachialis, then emerges laterally as the lateral cutaneous nerve of the forearm
- Motor
Coracobrachialis, biceps brachii, brachialis (anterior arm compartment)
- Sensory
Lateral surface of the forearm (lateral antebrachial cutaneous nerve)