(in'tĕr-trans-vĕr-sā'rē-ī mŭs'ĕlz) The paired muscles between transverse processes of adjacent vertebrae; there are anterior and posterior muscles in the cervical region; lateral and medial muscles in the lumbar region; and single muscles in the thoracic region. Synonym(s): musculi intertransversarii [TA] , intertransverse muscles.