Level of the lower border of the lung at the mid-axillary line is -
The inferior margin of pleura extends onto diaphragm at the level of (Costodiaphragmatic line)
-        8th rib in the midclavicular line
-        10th rib in mid-axillary line
-        12th rib at the lateral border of erector spinae.
The lower border of lungs extends till the level of
-        6th rib in the midclavicular line
-        8th rib in mid-axillary line
-        10th rib at the lateral border of erector spinae.
6th rib
8th rib
10th rib
12th rib