The diaphragm is the most important respiratory muscle and separates the chest cavity from the abdomen.
The arterial supply (vascular supply diaphragm) is complex and takes place over four different branches, which branch out strongly. These are, first, the superior diaphragmatic arteries ( superior phrenic arteries ), the pericardiac pericardial artery ( AERP ), and the musculo-pulmonary artery ( Arteria musculophrenica ), all of which originate from the thoracic aorta ( aorta thoracica ). The further arterial supply takes place via the lower diaphragmatic arteries ( Arteriae phrenicae inferiores ), which comes from the abdominal aorta ( aorta abdominalis ) (vascular supply diaphragm).
Venous drainage takes place via veins of the same name into the superior vena cava ( superior vena cava ). Only the lower diaphragmatic veins ( inferior vein pore ) opens into the inferior vena cava ( vena cava inferior ) (vascular supply diaphragm).