Lung Empyema Anatomy
Inside the chest, the windpipe, or trachea, divides into two smaller tubes: the right bronchus and the left bronchus. The right bronchus enters the right lung and the left bronchus enters the left lung. The right bronchus and left bronchus branch into smaller and smaller tubes.
The smallest tubes, called bronchioles, end in tiny air sacs, called alveoli. Blood flows very close to the walls of the alveoli. Oxygen and carbon dioxide pass between the air and the bloodstream through the wall of the alveoli.
- Graham EA. Principles involved in the treatment of acute and chronic empyema. 1924. J Am Coll Surg. 2005 Aug;201(2):157. 
- Maskell NA, Davies CW, Nunn AJ, Hedley EL, Gleeson FV, Miller R, Gabe R, Rees GL, Peto TE, Woodhead MA, Lane DJ, Darbyshire JH, Davies RJ; First Multicenter Intrapleural Sepsis Trial (MIST1) Group. U.K. Controlled trial of intrapleural streptokinase for pleural infection. N Engl J Med. 2005 Mar 3;352(9):865-74. 
- Tsai TH, Jerng JS, Chen KY, Yu CJ, Yang PC. Community-acquired thoracic empyema in older people. J Am Geriatr Soc. 2005 Jul;53(7):1203-9.