Which wrist flexor muscle is innervated by the median nerve?

Which wrist flexor muscle is innervated by the median nerve?

• A. Flexor Carpi Ulnaris
• B. Flexor Carpi Radialis
• C. Extensor Carpi Radialis
• D. Flexor Digitorum Superficialis

Answer: (B)

Wrist flexion is carried out by forearm flexors, and the nerve supply helps identify which muscle can actively flex the wrist. The Flexor Carpi Radialis is a primary wrist flexor that is innervated by the median nerve. It runs from the medial epicondyle to the base of the second metacarpal and flexes the wrist while also helping to abduct the hand. In contrast, the Flexor Carpi Ulnaris is innervated by the ulnar nerve and mainly flexes and adducts the wrist. The Extensor Carpi Radialis lies on the back of the forearm and extends the wrist, supplied by the radial nerve. The Flexor Digitorum Superficialis is also median-nerve–innervated but its main role is flexing the fingers at the proximal interphalangeal joints, with wrist flexion being secondary. Thus, the wrist flexor muscle innervated by the median nerve is Flexor Carpi Radialis.

Wrist flexion is carried out by forearm flexors, and the nerve supply helps identify which muscle can actively flex the wrist. The Flexor Carpi Radialis is a primary wrist flexor that is innervated by the median nerve. It runs from the medial epicondyle to the base of the second metacarpal and flexes the wrist while also helping to abduct the hand. In contrast, the Flexor Carpi Ulnaris is innervated by the ulnar nerve and mainly flexes and adducts the wrist. The Extensor Carpi Radialis lies on the back of the forearm and extends the wrist, supplied by the radial nerve. The Flexor Digitorum Superficialis is also median-nerve–innervated but its main role is flexing the fingers at the proximal interphalangeal joints, with wrist flexion being secondary. Thus, the wrist flexor muscle innervated by the median nerve is Flexor Carpi Radialis.