|Budget Amount *help
¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1990 : ¥200,000 (Direct Cost : ¥200,000)
Fiscal Year 1989 : ¥1,800,000 (Direct Cost : ¥1,800,000)
Macroscopic findings of the bronchial arteries have not been described in detail satisfactorily, and positional relations of these arteries to the surrounding structures also have been neglected. The author dissected this artery macroscopically from the origin to the pulmonary root in 100 human adults. Against the descriptions of textbooks, two right and two left bronchial arteries were most commonly observed. Origin of the arteries could be classified into five portions, 1) right aortic intercostal artery, 2) right subclavian artery, 3) left subclavian, 4) aortic arch, 5) descending aorta. On the other hand, four branches could be distinguished in the course along the bronchi, that is, right superior, right inferior, left superior and left inferior, which passed on the superior or inferior wall of the corresponding bronchus.
A definite relationship could be observed between the above-mentioned five origins and the four branches at the pulmonary roots. That is, the right superior branch mostly arose from origin 1) (85%), sometimes from 2), and the left inferior branch arose from 5) (97%), sometimes from 4). The right inferior and left superior branches often arose in a common trunk from 4), in a few cases from 3), and in other cases, they arose independently from origin 5). Origin of the right inferior branch was most varied. The branches from 2) and 3) were mostly supplementary. Summarizing the results of this study, all the feasible arrangements of the bronchial arteries as to the origin and course were illustrated schematically in Figure (see the text).
The bronchial veins were also dissected macroscopically in both extra- and intrapulmonary courses. Strictly speaking, clear distinction cannot be made anatomically between the pulmonary and the bronchial veins. Blood circulation of the lung was considered from the results of this study.