What nerve innervates the coracobrachialis muscle?

The coracobrachialis muscle is primarily innervated by the musculocutaneous nerve. This nerve branches from the brachial plexus and is responsible for supplying the anterior compartment of the arm, which includes the coracobrachialis along with the biceps brachii and the brachialis muscles. The musculocutaneous nerve not only provides motor innervation to these muscles but also sensory innervation to the skin over the lateral aspect of the forearm. Understanding this innervation is crucial for grasping the functional anatomy of the upper extremity and the specific roles of the muscles within the arm.