Thurlbeck A, Horsfield K
Respir Physiol. 1980 Aug;41(2):173-81. doi: 10.1016/0034-5687(80)90050-x.
Angles of branching in the bronchial tree were measured in one greyhound dog lung cast, and analysed from the data for man, dog, rat and hamster obtained by Raabe et al. (1976). The bronchial trees were ordered by both Strahler's and Horsfield's methods and angles classified by the value of delta, a measure of asymmetric branching defined as the difference in order between the branches forming the angle. Angles were also classified by their position in the bronchial tree, according to the order of the parent branch. It was found that whereas in the greyhound lung mean branching angle decreased with increasing order, there was no consistent trend in the data of Raabe et al., at least down to 3 mm diameter bonchi in man and 2 mm diameter bronchi in beagle dogs. There was, however, a decrease in main branch angle and an increase in minor branch angle with increasing delta.
在一只灵缇犬的肺铸型中测量了支气管树的分支角度，并根据拉贝等人（1976年）获得的人类、狗、大鼠和仓鼠的数据进行了分析。支气管树按照斯特拉勒法和霍斯菲尔德法进行排序，角度根据δ值进行分类，δ是一种不对称分支的度量，定义为形成角度的分支之间的阶数差异。角度还根据其在支气管树中的位置，按照母支的阶数进行分类。结果发现，在灵缇犬的肺中，平均分支角度随阶数增加而减小，而在拉贝等人的数据中没有一致的趋势，至少在人类直径为3毫米的支气管和比格犬直径为2毫米的支气管以下是这样。然而，随着δ的增加，主支角度减小，次支角度增加。
