The Ultrastructure of the Skin of Human Embryos

Abstract

Electron microscopic studies were performed on the embryonic intradermal hair canal formation in the scalp and eyebrow skin using eleven Negro embryos of the menstrual ages of 9 to 18 weeks. It was found that the intradermal hair canal was formed by cellular death of the centrally located core cells which dropped in from the stratum intermedium of the epidermis when the cells of the stratum basale bulged out and descended as the hair germ.