interspinalis

noun
in·​ter·​spi·​na·​lis | \ˌint-ər-ˌspī-ˈnal-əs, -ˈnā-ləs \
plural interspinales\ -​ˌlēz \

Medical Definition of interspinalis 

: any of various short muscles that have their origin on the superior surface of the spinous process of one vertebra and their insertion on the inferior surface of the contiguous vertebra above

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