Abstract
Specimens from 6- to 22-week-old human embryos and foetuses were examined by electron microscopy. Three interesting observations were noted: (1) Mitotic activity was exhibited in the periderm. (2) A cluster of ribosome-like granules, its nature being unknown, was found in the infra-nuclear cytoplasm of basal cells. (3) A peculiar structure resembling the Schwann-cell/axon complex with an efferent-type of nerve ending was found in a 10-week-old specimen in which the papillae of lamina propria had newly emerged. It is possible that this kind of nerve ending may have functional significance to cell differentiation.
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