The musculocutaneous nerve is a branch of the lateral cord of the brachial plexus (C5–C7) and primarily supplies the anterior compartment of the arm.
Muscles of anterior compartment of arm (Mnemonic: BBC)
• Biceps brachii
• Brachialis
• Coracobrachialis
Key Points:
• It pierces the coracobrachialis muscle.
• It provides motor innervation to all three muscles of the anterior arm.
• It continues as the lateral cutaneous nerve of the forearm, supplying sensory innervation to the lateral forearm.