Anatomy Thorax 5e5696e1 Which of following is attached to first rib? A Scalenus posterior B Serroatus posterior superior C Scalenus medius D None of the above High-Yield Explanation Scalenus mediums attached to the first rib. B D CHOURASIAS HUMAN ANATOMY UPPER LIMB THORAX VOLUME, 1 SIXTH EDITION, Page no,199