opponens digiti minimi

noun
opponens dig·​i·​ti min·​i·​mi | \-ˈdij-ə-ˌtī-ˈmin-ə-ˌmī \

Medical Definition of opponens digiti minimi 

: a triangular muscle of the hand that arises from the hamate and adjacent flexor retinaculum, is inserted along the ulnar side of the metacarpal of the little finger, and functions to abduct, flex, and rotate the fifth metacarpal in opposing the little finger and thumb

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