What is the primary muscle for wrist radial deviation?

The primary muscle responsible for wrist radial deviation is the flexor carpi radialis. This muscle originates from the medial epicondyle of the humerus and inserts on the base of the second and third metacarpals, allowing it to pull the wrist toward the radial side of the forearm. Additionally, the extensor carpi radialis longus and extensor carpi radialis brevis assist in this movement.