[Transmission and scanning electron microscopic investigation of the structure of so-called Clara cells of the bronchial system].

The epithelium of the bronchi and bronchioles were systematically examined in the lungs of rabbits. Particular attention was paid to the morphology of the Clara cells in the secretory phases. The apocrine secretion of these cells could be reconstructed from the results obtained. On the basis of morphological observations, the Clara cells produced a serous secretion which was mixed with the mucous secretion of the goblet cells in the bronchi. From these morphological results, the effect of substances which break down the secretion and also the morphological relationship of the Clara cells gain special interest.