Pleuropericardial Membrane

Primitive pleural cavity

Parietal pleura

Primitive Lung

Primitive pleural cavity

Parietal pleura

Fibrous pericardium

Pericardial cavity

Lung

Visceral pleura

Fibrous pericardium

Pericardial cavity

Lung

Visceral pleura

Pleuropericardial Folds

Superior vena cava

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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Getting Back Into Shape After The Pregnancy

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Once your pregnancy is over and done with, your baby is happily in your arms, and youre headed back home from the hospital, youll begin to realize that things have only just begun. Over the next few days, weeks, and months, youre going to increasingly notice that your entire life has changed in more ways than you could ever imagine.

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