Which of the following muscles will the lateral cord of the brachial plexus innervate?

E. One of the nerves that form from the lateral cord of the brachial plexus is the musculo-cutaneous nerve. The musculocutaneous nerve will innervate muscles derived from the anterior condensation (flexors). The biceps brachii muscle is a flexor at the elbow joint. Note that the biceps brachii muscle and the musculocutaneous nerve are related embryologically to the anterior condensation and anterior divisions (which form the lateral cord) and in the adult are located anterior. This occurs because of the lateral rotation of 90.