does the crura of the diaphragm develop from the dorsal mesentry
The pleuroperitoneal membranes fuse with the dorsal mesentery of the esophagus and with the dorsal portion of the septum transversum to complete the partition between the pleural and peritoneal cavities. The membranes form the primitive diaphragm but end up as only a small portion of the fully developed diaphragm.The dorsal mesentery of the esophagus fuses with the two structures septum transversum and the pleuroperitoneal membranes to form the middle of the diaphragm.Other muscle fibers that grow into the dorsal mesentery of the esophagus will develop into the crura of the fully developed diaphragm.he first strucuture to become part of the diaphragm is the septum transversum, a mesodermal strucutre that forms the central tendon of the diaphragm. The septum transversum is identifiable at three weeks of gestation as a mass of mesoderm just posterior to the pericardial cavity, which contains the heart.