Definition: One of a pair of viscera occupying the pulmonary cavities of the thorax, the organs of respiration in which blood is aerated. In humans, the right lung is slightly larger than the left and is divided into three lobes (an upper, a middle, and a lower or basal), whereas the left has but two lobes (an upper and a lower or basal). Each lung is irregularly conic, presenting a blunt upper extremity (the apex), a concave base following the curve of the diaphragm, an outer convex surface (costal surface), a generally concave inner or medial surface (mediastinal surface), a thin and sharp anterior border, and a rounded posterior border.
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