Final answer:
The flexor digitorum superficialis and flexor digitorum profundus are the only two muscles that flex both the fingers and the hand at the wrist. They are essential for hand and finger movement, enabling activities like typing and grasping objects.
Step-by-step explanation:
The only two muscles that have the action of flexing both the fingers and the hand at the wrist are the flexor digitorum superficialis and the flexor digitorum profundus. These muscles are located in the anterior compartment of the forearm and play a critical role in grasping and fine motor activities. While the flexor digitorum superficialis primarily acts to flex the hand and the digits, the flexor digitorum profundus flexes the phalanges of the fingers in addition to the hand at the wrist. The action is essential for various daily activities, such as typing or holding objects.
Other muscles related to finger and hand movement include the extensor digitorum, which extends the fingers and the hand, and the hypothenar muscles such as the abductor digiti minimi, flexor digiti minimi brevis, and the opponens digiti minimi, which act on the little finger. The intermediate muscles, including the lumbrical, the palmar interossei, and the dorsal interossei, act on all the fingers.