Abstract
The bronchial ramification and lobular division in lungs of two chimpanzees (Pan troglodytes) were examined from the viewpoint of comparative anatomy, on the basis of the fundamental structure of bronchial ramification of the mammalian lung (Nakakuki, 1975, 1980). The right lung of the chimpanzee consists of the upper, middle, and lower lobes, whereas the left lung consists of the middle and lower lobes. The right and left lungs have the dorsal bronchiole system, lateral bronchiole system, and medial bronchiole system. The ventral bronchiole system is lacking on both sides. The right upper lobe is formed by the first branch of the dorsal bronchiole system. The right middle lobe is formed by the first branch of the lateral bronchiole system, and the right accessory lobe bronchiole is lacking. The remaining bronchioles constitute the right lower lobe. In the left lung, the upper and accessory lobes are lacking. The well developed middle lobe is formed by the first branch of the lateral bronchiole system. The left lower lobe is formed by the remaining bronchioles. Furthermore, these bronchioles are compared with those of the human lung byBoyden (1955).
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