Besides the supinator, the other muscle that is a powerful supinator of the forearm is: the biceps brachii. The biceps brachii is responsible for elbow flexion and forearm supination.
The biceps brachii is a large, thick muscle on the front of our upper arm that is located between the shoulder and the elbow. This muscle often looks like a horseshoe shape. The biceps brachii’s primary function is as an extension of the elbow joint.
While the biceps are located on the front upper arm, there are other muscles known as the triceps on the back of the upper arm, which are responsible for arm extension.
Learn more about the triceps here https://brainly.com/question/28044611
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