diaphragm MUSCULAR TENDINOUS STRUCTURE structure Double domed shape Peripherally consist of muscles Centrally tendons origin From three parts; Sternal part, posterior surface of xiphoid process Costal part, from deep surface of lower six ribs and their costal cartilage Vertebral part, vertebral column or crura Nerve supply Motor nerve supply, Right and left phrenic nerve Sensory nerve, from lower six intercostal nerve Arterial supply Pericardiopheranic artery Musculopheranic artery Superior phrenic artery Inferior pheneric artery Venous drainage Pericardiopherenic vein Musclopherenic vein Superior pherenic vein Inferior pherenic vein Openings of diaphragm Three major opening 1-aortic opening 2-Esophageal opening 3-caval opening