Pleuropericardial Membrane
Primitive pleural cavity
Primitive pleural cavity
Parietal pleura
Fibrous pericardium
Pericardial cavity
Lung
Fibrous pericardium
Pericardial cavity
Lung
Visceral pleura
Parietal pleura
Pleural cavity
Phrenic nerve
Figure 10.5 A. Transformation of the pericardioperitoneal canals into the pleural cavities and formation of the pleuropericardial membranes. Note the pleuropericardial folds containing the common cardinal vein and phrenic nerve. Mesenchyme of the body wall splits into the pleuropericardial membranes and definitive body wall. B. The thorax after fusion of the pleuropericardial folds with each other and with the root of the lungs. Note the position of the phrenic nerve, now in the fibrous pericardium. The right common cardinal vein has developed into the superior vena cava.
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