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The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic.
The inner side of the lungs is lined by two layers of membrane. The outer layer of the lungs is the Parietal pleura which adhere to the chest wall. Visceral pleura, which is the inner one of the two layers, varies from Parietal pleura in a few respects. It is not sensitive to pain, unlike the parietal pleura.