Variants of shape of the pulmonary alveoli in corrosion casts in human lungs.

The shape of the pulmonary alveoli in pulmonary acini was investigated in corrosion casts and in translucent slices. Five types of the pulmonary alveoli in corrosion casts were distinguished. Most of them were spherical or saucer-shaped. In slices, made translucent in methyl salicylate, the pulmonary alveoli filled with the air were always spherical.