Suggested nomenclature for terminal orders of bronchial ramifications and segmental arteries in the upper lobe of the left human lung.

Official nomenclature of bronchi and of pulmonary arteries includes segmental and some subsegmental branches. However, progress in clinical practice requires that nomenclature of subsequent order ramifications should be introduced. Nomenclature of the branches suggested by other authors is presented. Analysis of pulmonary artery branching within the upper lobe of the left lung, made on 150 corrosive preparations, and analysis of radiograms has prompted the author to suggest his own notation for the fifth and sixth order branches.