Which of the following is a wrist flexor?

Which of the following is a wrist flexor?

• A. Flexor Carpi Radialis
• B. Extensor Carpi Ulnaris
• C. Extensor Digitorum
• D. Abductor Pollicis Longus

Answer: (A)

The wrist flexors are the muscles in the anterior forearm that bend the wrist at the radiocarpal joint. Among the options, the flexor carpi radialis is part of that front forearm group and its main action is to flex the wrist; it also assists with radial deviation of the hand. The others are wrist extensors or thumb/hand movers: extensor carpi ulnaris and extensor digitorum lie in the posterior compartment and extend the wrist (and extend the fingers, in the case of the extensor digitorum). Abductor pollicis longus is a thumb abductor (and can aid in wrist abduction) but not a wrist flexor. Therefore, the wrist flexor in this set is the flexor carpi radialis.

The wrist flexors are the muscles in the anterior forearm that bend the wrist at the radiocarpal joint. Among the options, the flexor carpi radialis is part of that front forearm group and its main action is to flex the wrist; it also assists with radial deviation of the hand.

The others are wrist extensors or thumb/hand movers: extensor carpi ulnaris and extensor digitorum lie in the posterior compartment and extend the wrist (and extend the fingers, in the case of the extensor digitorum). Abductor pollicis longus is a thumb abductor (and can aid in wrist abduction) but not a wrist flexor. Therefore, the wrist flexor in this set is the flexor carpi radialis.