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[Morphology of the apudocytes and neuroepithelial bodies in the lungs of rats].

Endocrine cells (apudocytes) and neuroepithelial bodies (NEBs) were revealed in the lungs of rats of different ages by Grimelius' argyrophilic method. Solitary apudocytes were found among the bronchial epitheliocytes, they had the oval, columnar or triangular shape. NEBs comprise groups of argyrophilic cells, in some cases the penetration of neural fibers into the bodies and their branching in the terminals are observed. Apudocytes and NEBs in 1-, 7-, and 15-day-old rats are more numerous in the epithelium of small than big bronchi. In 21- and 30-day-old and in adult animals apudocytes and NEBs are very scarce. The elements under study are likely to take part in the early postnatal development of the rat lungs.