The organ lung comprises of a left and right lung, divided in slightly unequal proportions that occupy most of the intrathoracic space. The right lung represents 56 percent of the total lung volume and is composed of three lobes, a superior, middle, and inferior lobe, separated from each other by a deep horizontal and an oblique fissure. The left lung, smaller in volume because of the asymmetrical position of the heart, has only two lobes separated by an oblique fissure. The space between the lungs is filled by a connective tissue space containing the heart, major blood vessels, trachea with the stem bronchi, oesophagus and thymus gland. In the thorax, the two lungs rest with their bases on the diaphragm, while their apices extend above the first rib.
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