Figure 3.

Diaphragm morphogenesis. Classical description of the origins of the human muscular diaphragm, depicted at 5 weeks (A) and 4 months (B) of gestation. The diaphragm is described as arising from the septum transversum, pleuroperitoneal folds (PPF), esophageal mesentery and thoracic body wall. (After Sadler [6]).