Reset Help Thenar eminence: the mass of tissue at the base of the thumb. Hypothenar eminence: the mass of tissue at the base of the little finger. Flexor pollicis brevis: muscle that flexes the thumb. opponens digiti minimi Adductor pollicis muscle: muscle that pulls the first metacarpal laterally to oppose thumb toward center of palm. Opponens pollicis : muscle that brings the little finger into opposition with thumb. Flexor digiti minimi brevis: the muscle that flexes the little finger.

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