In mid clavicular plane, lower border of lung lies at level of:
4th rib
6th rib
8th rib
10th rib
The lower border of the lung in midinspiration follows a curving line, which crosses the 6th rib in the midclavicular line and the 8th rib in the midaxillary line, and reaches the 10th rib adjacent to the veebral column posteriorly.