Overview Innervation of Diaphragm motor supply from left and right phrenic nerves arising from ventral rami of C3, C4, C5 “C3, C4, C5 keeps diaphragm alive” diaphragm irritation causes referred pain to shoulder Diaphragmatic Apertures permit structures to pass between thorax and abdomen T8 inferior vena cava (IVC) branches of right phrenic nerve T10 esophagus left and right vagus nerves esophageal branches of left gastric vessels T12 aorta azygos vein thoracic duct