The costal pleural reflection is the line along which the costal pleura and diaphragmatic pleura surfaces merge. It can be approximated on the surface of the thorax by a line connecting:
The posteroinferior margin of the parietal pleura is inferior to the head of the 12th rib within the costovertebral angle on each side. It is at this point that the pleura is prone to accidental surgical incision.
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