On expiration, the lung is approximately at the level of
a. the fifth rib at the midaxillary line.
b. T3.
c. T10.
d. the oblique fissure.
C
Posteriorly, the lower lung border extends to the level of T12, and to T10 on deep expiration. The lobes of the right and left lungs are divided by grooves called fissures. On the anterior chest, the oblique (the major, or diagonal) fissure crosses the fifth rib in the midaxillary line and terminates at the sixth rib in the midclavicular line.
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