anatomy Motor muscles of the bust EXTENSION large backbone interspinous intertransversarii rotator multifidus semispinali. spinal very long Erector INCLINATION external oblique internal oblique square of the loins iliopsoas large backbone intertransversarii rotator multifidus semispinali very long Erector TWIST ipsilateral internal oblique external obliquecontralateral contralateral rotators contralateral multifidus contralateral seminals BENDING straight abdomenUpper limbLower limbTrunkAbdomenArticles