The Diaphragm and Organs in Contact with it—A, in Expiration;
B, at the End of a Deep Inspiration. Transverse Vertical Sections in the
Line of the Armpit.

A, At the end of an ordinary expiration the lung does not extend below the upper border of the eighth rib. From this level to the middle or lower border of the tenth rib the two layers of the pleura covering respectively the inner wall of the chest and the upper surface of the diaphragm are in contact.
B, When the lung is distended with air it occupies the whole of the pleural cavity.