In mid clavicular plane, lower border of lung lies at level of:
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.
4th rib
6th rib
8th rib
10th rib