. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 272. A, Dark band in caudal fin of white-adapted Fundulus produced by severance of radial nerves. B, Redarkening of a faded band following a second, more distal cut. From Parker.^ The great majority of the teleost fishes thus far carefully investigated ap- pear to possess dineuronic melanophores. One type of innervating nerve fiber, a pigment-concentrating one, is readily demonstrated by electrical stimulation of appropriate loci in the central nervous system, of central nerve tracts, or of peripheral nerve
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 272. A, Dark band in caudal fin of white-adapted Fundulus produced by severance of radial nerves. B, Redarkening of a faded band following a second, more distal cut. From Parker.^ The great majority of the teleost fishes thus far carefully investigated ap- pear to possess dineuronic melanophores. One type of innervating nerve fiber, a pigment-concentrating one, is readily demonstrated by electrical stimulation of appropriate loci in the central nervous system, of central nerve tracts, or of peripheral nerves. The extent of the area of the skin blanching under this stimulation parallels the area of the skin innervated by these nervous elements. Furthermore, after denervation of any area of the skin the denervated area no longer exhibits blanching responses to stimulation of the nerves central to the point of denervation, even though responses may con- tinue in the adjacent areas. Therefore the blanching produced by nerve stim- ulation in the animals is a result of localized responses at the region of the ner\'e terminations and is not due to freely diffusible substances in the blood. The action of the concentrating fibers is believed by Parker^^^ to be mediated through adrenalin-like material which is liberated by the nerve terminations and which diffuses through the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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