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The skin consists of the epidermis, dermis and hypodermis. The upper layer, the epidermis, includes 5 other sub-layers. The stratum corneum, the uppermost layer, contains the oldest cells. At one time, it was thought that skin shrivels as the stratum corneum swells due to water.
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Later, experts revealed that the wrinkling of the skin is due to the activity of blood vessels. While a person is in water, his nervous system sends a signal to the blood vessels and they constrict. This leads to a slight decrease in the volume of the fingertips and the formation of skin folds.
