DiaphragmBronchusBronchus to superior lobePulmonary arteryPulmonary veinsRib ISubclavian arterySubclavian veinEsophagusPosteriorAnteriorInferior vena cavaAzygos veinLeft brachiocephalic veinRight brachiocephalic veinHeartInferior lobeSuperior lobeMiddle lobeSuperior vena cavaOblique fissureHorizontal fissureAB