. The American journal of anatomy . Fig. 1 Cut plane of positive wax-plate model. Original model SO X reduced to 50 X. Cut parallel to the pleura, 3 cm. apart from it. Pleural larger cavities shown in the figure are air-sacs. The smaller recesses in theirwalls are alveoli. Fig. 2 Cut plane of the positive wax-plate model. Magnification same as figure cm. apart from the former cut plane. Pleural side. The larger cavities arealveolar ducts and air-sacs. 317 318 CHIKANOSUKE OGAWA DIVISION OF THE FINER RESPIRATORY TUBULES According to B. N. A. there are two divisions o
. The American journal of anatomy . Fig. 1 Cut plane of positive wax-plate model. Original model SO X reduced to 50 X. Cut parallel to the pleura, 3 cm. apart from it. Pleural larger cavities shown in the figure are air-sacs. The smaller recesses in theirwalls are alveoli. Fig. 2 Cut plane of the positive wax-plate model. Magnification same as figure cm. apart from the former cut plane. Pleural side. The larger cavities arealveolar ducts and air-sacs. 317 318 CHIKANOSUKE OGAWA DIVISION OF THE FINER RESPIRATORY TUBULES According to B. N. A. there are two divisions of the finerrespiratory passages, namely, bronchiolus respiratorius and duc-tulus alveolaris. The space from which the end branches dividethemselves is designated by Miller the atrium. This name isadopted in several text-books. Several names are proposed forthe end branches of the alveolar ducts—sacculus alveolaris,. Fig. 3 Negative model including two air-saes adjacent to ])kMirn. Originalmodel 100 X enlarged. Figure reduced to 50 X. infundibulum, end-sac, air-sac, and so on. Some authors (Cru-veillier and Brass) use the word infundibulum loosely forductulus alveolaris. Furthermore, Nicolas and Testut ratherunnecessarily give the name vestibule to the space between thebronchiolus respiratorius and the ductulus alveolaris. Now I will come to the detailed description of the alveolarducts, HUMAN LUNG 319 ORDER, ANGLE, AND TYPE OF RAMIFICATION Alveolar ducts are closely beset by alveoli. Therefore thedesignation wall of the alveolar ducts means only the smallspaces between each alveolar mouth. The alveolar ducts divide themselves several times to reachthe air-sacs. According to Laguesse, there are six or sevenramifications before the air-sacs are reached. In my model thereare four groups of alveolar ducts. I counted the orders intowhich the alveolar ducts divide before reaching the air-sacs asfollows
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