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Martha F. Greenwood, MD; Phillip Holland, MD

Am J Dis Child. 1975;129(3):289-294.

Abstract
As viewed by scanning electron microscopy, the luminal surface of the human trachea at 12 weeks' gestation shows a predominance of microvillous-covered, nonciliated cells, in contrast to the heavily ciliated tracheobronchial surface seen at 34 weeks' gestation. Hyaline membrane disease produces a confluent lining material in the lung periphery that obscures the bronchiolar and alveolar surface architecture. Large saucershaped alveoli, numerous alveolar pores, and an abundance of in situ alveolar macrophages are observed in chronic bronchitis and in emphysematous lungs.

The scanning electron microscope offers an additional tool for the study of developmental and pathological processes in the human respiratory tract.

Author Affiliations
From the Department of Pediatrics, University of Kentucky School of Medicine, Lexington.

Footnotes
Received for publication May 28, 1974; accepted Aug 20.

Reprint requests to Department of Pediatrics, University of Kentucky School of Medicine, 800 Rose St, Lexington, KY 40506 (Dr. Greenwood).

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