Final answer:
The primary movers of wrist flexion include the flexor carpi radialis, flexor carpi ulnaris, and flexor digitorum superficialis, with the flexor carpi radialis specifically flexing and abducting the wrist.
Step-by-step explanation:
The muscles that cause wrist flexion are part of the extrinsic muscles of the hand, which originate in the forearm. The primary movers for wrist flexion are the flexor carpi radialis, flexor carpi ulnaris, and the flexor digitorum superficialis. The flexor carpi radialis is a muscle that flexes the wrist and also helps in its abduction. It is essential to note that in addition to flexing the hand, these muscles can also perform other actions like abduction or adduction depending on the muscle involved.
The superficial group includes the flexor carpi radialis, palmaris longus, and flexor carpi ulnaris. The flexor carpi ulnaris is innervated by the ulnar nerve while both the flexor carpi radialis and palmaris longus are innervated by the median nerve. Each of these muscles allows for the flexion of the wrist.