Nerves and nerve endings in pigmented nevi. Part I.

Electron microscopic investigations revealed numerous unmyelinated nerve fibres in different types of pigmented nevi. The structure of these fibres was similar to the cutaneous unmyelinated fibres. Axon terminals were observed between nevus cells and smooth muscle cells, the former proved to be efferent-type free endings. Pure receptor-type endings were rarely seen. The contradiction between the receptor-like construction ov nevic corpuscles and the abundance of the effector-type endings is discussed.