Final answer:
The muscles located midway between the shoulder and elbow in the anterior compartment of the arm are the biceps brachii, brachialis, and brachioradialis.
Step-by-step explanation:
Midway between the shoulder and the elbow, the muscles of the anterior compartment of the arm are the biceps brachii, brachialis, and brachioradialis muscles. These muscles are responsible for flexing the forearm and are part of the anterior flexor compartment of the arm. The biceps brachii is a two-headed muscle that also contributes to supinating the forearm and flexing the arm at the shoulder joint. Located deep to the biceps brachii, the brachialis muscle provides additional power for flexing the forearm. The brachioradialis, meanwhile, can flex the forearm quickly or help in lifting a load slowly.