Answer
The most powerful flexor, and the more powerful extensor of the forearm, are the brachialis and the triceps brachii, respectively.
Work Step by Step
The flexor muscles of the forearm (at the elbow joint) are the brachialis, the biceps brachialis, and the brachioradialis. Of these muscles of the anterior compartment, the brachialis is the most powerful.
The forearm extensors are located in the posterior compartment. The triceps brachii is more powerful than the Anconeus.
