Palmar interossei muscles - Wikipedia - Abduct and adduct fingers and thumb
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The palmar interosseous muscles. In human anatomy, the palmar or volar interossei are three small, unipennate muscles in the The palmar interosseous muscles adduct the fingers towards the middle finger. This is in contrast to the dorsal interossei, which abduct the fingers away from the middle finger. In addition (like dorsal interossei) they flex the finger.