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The architecture of stratum corneum after wounding.

The influence of epidermal damage on the orderly stacking of horny cells of the mouse ear was studied by fluorescence microscopy. Two types of wounding were compared: compression (10 Kg/cm 2 for 4 sec) or superficial wounding by needle scratching. Scratching caused a complete loss of order in the rapidly forming new horny layer, while the application of pressure without cell damage resulted in increased mitotic activity alone without loss of cell stacking. It is concluded, that the formation of cell columns in keratinizing epithelia is not hindered by a sudden increase in mitotic activity. However, it is replaced by randomly arranged horny cells and a slowly re-appearing stacked horny layer, when cell loss or cell damage has occurred.