<prompt> First rib is not related to-Sympathetic chainScalenus anteriorSuprapleural membraneT2 Nerve  <response>: Ans. is d i.e., T2 Nerve o Anteriorly, the neck of the first rib is related to from medial to lateral :-i Sympathetic chain, ii 1 posterior intercostal vein, iii Supeior intercostal artery, and iv 1st thoracic nerve. These structures are between neck of first rib posteriorly and apex of lung anteriorly.o Following are attached to first rib Scalenus anterior, scalenus medius, subclavius, serratus anterior 1st digitation, costo-clavicular ligament and suprapleural membrane. 