<prompt> VAN vein, artery, nerve sequence is present in intercostal space at:Upper border of ribMiddle border of ribLower border of ribMiddle portion of intercostal space  <response>: Ans. C Lower border of ribRef: Snells Clinical Anatomy, pg. 41 There are 11 intercostal spaces within the thoracic wall. The spaces are tilled in by 3 layers of intercostal muscles and their related fasciae and are bounded superiorly and inferiorly by the adjacent ribs. The costal groove is located along the inferior border of each rib upper aspect of the intercostal space and provides protection for the vein which is most superior and the nerve which is inferior in the groove VAN. 