Yes it is true that the musculocutaneous nerve is a major terminal nerve of the brachial plexus.
The lateral cord's musculocutaneous nerve (C5-7) is one of its terminal branches. The coracobrachialis, biceps brachii, and brachialis muscles are the three muscles that make up the anterior compartment of the arm and are innervated by the musculocutaneous nerve. It is also in charge of the lateral forearm's cutaneous innervation.
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