The programming of canalization in fetal lungs of man and monkey

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Abstract
In the monkey lung (Macacus nemestrina) canalization of all bronchopulmonary segments begins simultaneously at the peripheral future‐alveolar‐duct portions of each segment and then continues progressively centralwards. Its simultaneous appearance in all segments of a human lung of the 17th postovulatory week (19th postmenstrual week) has now been confirmed (cf. Boyden, '74). The mode of canalization, as seen under the light microscope, is here demonstrated.