iliocostalis

noun
il·io·cos·ta·lis | \-käs-ˈtā-ləs \

Medical Definition of iliocostalis 

: the lateral division of the sacrospinalis muscle that helps to keep the trunk erect and consists of three parts:

a : iliocostalis cervicis

b : iliocostalis lumborum

c : iliocostalis thoracis

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