ˌilēōˌkäˈstalə̇s, -tāl-, -täl- noun
( -es )
Etymology: New Latin, from ilio- + Late Latin costalis rib, from Latin costa rib + -alis (from -alis -al, adjective suffix)
: the lateral division of the sacrospinalis muscle that helps to keep the trunk erect and consists of a part from the ilium to the lower ribs which draws the trunk to the same side or depresses the ribs, a part from the lower to the upper ribs which draws the trunk to the same side and approximates the ribs, and a part from the ribs to the cervical transverse processes which draws the neck to the same side and elevates the ribs — called also respectively iliocostalis lumborum, iliocostalis dorsi, iliocostalis cervicis