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Quarterly Journal of Microscopical Science, Vol s3-96, 343-349, Copyright © 1955 by Company of Biologists
1 Department of Zoology and Comparative Anatomy, University College, London
In the skin of Rana and of Bufo there are certain coarse medullated nerve-fibres which give off unmyelinated branches dividing repeatedly to form richly varicose endings at various levels, but mainly in the stratum spongiosum of the dermis. There is no capsule. These fibres are of a type distinct from those medullated fibres which end freely in the epidermis. Their function is discussed: it is possible that they are fast nociceptive fibres.