OBSERVATIONS OF THE HUMAN PULMONARY CAPILLARIES AND ALVEOLAR CASTS UNDER THE SCANNING ELECTRON MICROSCOPE / 解剖学报

ABSTRACT

The architecture of the alveolus and its capillaries of human lung injected withsolution of ABS in methyl ethyl ketone was studied under the SEM.The results wereoutlined as follows1.The alveolar casts were observed from the subpleural and intralobular septu-lar surfaces.The human alveolus is irregular polygon in appearance.The size ofthe alveolus is variable,its surface is smooth,there are many depressions of the topof type Ⅱ cells.The bridge-like structure between two adjacent alveoli are thecasts of the alveolar pores.They are variable both in size and number,and ofround or oval shapes with smooth surface.2.Capillaries of the subpleural space and interlobular septulum are transitional,and identical in appearance.Meshes of the capillary network are larger than thoseof other parts,but more closer in density compared with those in dog.Each capil-lary is branched from the metaarteriole.3.Capillaries in the alveolar septum is a single layer of dense network,theirdiameter are larger than those of the mesh hole.They originate mainly from thecapillaries of subpleural space and interlobular septulum.