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Multiple Choice
Which of the following muscles is a primary flexor of the wrist and hand?
A
Supinator
B
Flexor carpi radialis
C
Brachioradialis
D
Extensor digitorum
Verified step by step guidance
1
Understand the function of each muscle listed in the problem. The Supinator is responsible for supination of the forearm, not flexion of the wrist or hand. The Brachioradialis primarily flexes the forearm at the elbow, not the wrist or hand. The Extensor digitorum extends the fingers and wrist, which is the opposite of flexion.
Identify the muscle that performs flexion of the wrist and hand. The Flexor carpi radialis is a muscle located in the forearm that is responsible for flexing and abducting the wrist.
Recall the anatomical location and function of the Flexor carpi radialis. It originates from the medial epicondyle of the humerus and inserts into the base of the second and third metacarpals, allowing it to flex the wrist and assist in hand movement.
Compare the functions of the listed muscles to determine which one matches the action of flexion of the wrist and hand. Only the Flexor carpi radialis fits this description.
Conclude that the Flexor carpi radialis is the primary flexor of the wrist and hand based on its anatomical function and location.