A patient cannot flex the distal interphalangeal joint of the index finger. Which muscle is impaired?
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Correct answer: Flexor digitorum profundus
Flexor digitorum profundus is the only muscle that flexes the distal interphalangeal joints of the fingers; flexor digitorum superficialis flexes the PIP joints. The portion serving the index finger is innervated by the anterior interosseous nerve.
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