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The peripheral nerve endings in the skin of the harbour porpoise Phocoena phocoena (Linné, 1758

Harbour porpoises live in estuaries and coastal waters, which have a natural pollution. During their evolution, harbour porpoises have adapted to life in muddy water with reduced visibility. Their echolocation system is therefore highly developed, as well as their senses of taste, smell and touch. The nerve-endings of the touch sense are primarily situated in the skin, which is rubber-like, soft and smooth. It is interesting to know how sensitive the skin is. The integument possesses an epidermal layer up to 4 mm thick. The superficial layer with parakeraotic cells is up to ten layers deep, and can be up to 40!-lm thick. The other epidermal layer has polyhedral prickle cells and extends peg-like into the cutical layer. Melanocytes are accumulated in the stratum spinosum and in the thin basal layer. The whole integument is penetrated by myelined and free merkless nerve-endings, and many kinds of nervous corpuscles, as known from amphibians, fish, birds, mammals. These as well as new forms of nerve-endings are demonstrated and their possible function is discussed in relation to their morphology and location.