Final answer:
The anterior arm's intermediate compartment contains the biceps brachii, brachialis, and brachioradialis muscles which are involved in flexing the forearm and other movements.
Step-by-step explanation:
The muscle found in the intermediate compartment of the anterior arm, also known as the anterior flexor compartment of the arm, includes the biceps brachii, brachialis, and brachioradialis. The biceps brachii is notable for its role in flexing the forearm and is involved in the supination of the forearm at the radioulnar joints, as well as flexing the arm at the shoulder joint. Deep to the biceps brachii, the brachialis muscle significantly aids in flexing the forearm. The brachioradialis is also part of this compartment and is responsible for flexing the forearm efficiently and assisting in lifting loads.