<prompt> A congenital diaphragmatic hernia may result from failure of theSeptum transversum to developPleuroperitoneal membranes to fuse in a normal fashionPleuropericardial membrane to develop completelyDorsal mesentery of the esophagus to develop  <response>: The formation of the diaphragm occurs through the fusion of tissue from four different sources. The pleuroperitoneal membranes normally fuse with the three other components during week 6 of development. Abnormal development or fusion of one or both of the pleuroperitoneal membranes causes a patent opening between the thorax and abdomen through which abdominal viscera may herniate. fig:- development of diaphragm 