Final answer:
The muscle that causes both flexion and radial deviation of the wrist is the flexor carpi radialis, which is a flexor muscle in the anterior compartment of the forearm.
Step-by-step explanation:
The muscle that is responsible for causing both flexion and radial deviation of the wrist is known as the flexor carpi radialis. This muscle is part of the anterior compartment of the forearm and works as a flexor muscle that decreases the angle at the joint.
Additionally, the flexor carpi radialis assists in abduction of the hand at the wrist, which correlates with radial deviation. On the other hand, muscles such as the extensor carpi radialis brevis and extensor radialis longus act as extensors, increasing the angle at the joint, and they both extend and abduct the hand at the wrist. It's important to note that the muscles in the anterior compartment, including the flexor digitorum superficialis and flexor digitorum profundus, primarily facilitate hand and finger flexion.