The pigmentary system of planaria. II. Physiology and functional morphology

Cell and Tissue Research
G PalladiniA Carolei

Abstract

The pigmentary system of the planaria, Dugesia gonocephala s.l. (Platyhelminthes, Turbellaria, Tricladida), consists of granules contained in chromatophore cells distributed in the parenchyma tissue. The administration of MSH release-inhibiting Factor (M.I.F.) leads to an easily observable general decolouration of the animal due to the migration of the pigment granules towards the deeper-lying cell nucleus. In planarians bisected transversely through the pharyngeal region, the decolouration occurs only in the cephalic segment, and the caudal segment remains dark. When, however, the decapitated caudal segment regenerates a head region, a decolouration response occurs when exposed to M.I.F. The significance of these results is discussed, and an hypothesis on the hormonal regulation of the pigmentary system is proposed.

References

Jan 1, 1976·Pharmacology, Biochemistry, and Behavior·A BarbeauA J Kastin
Jun 27, 1979·Cell and Tissue Research·G PalladiniA Carolei
May 1, 1975·General and Comparative Endocrinology·M E HadleyA Bower
Jun 27, 1979·Cell and Tissue Research·G PalladiniA Carolei
Jan 1, 1970·Annual Review of Physiology·M Fingerman
Jan 1, 1974·General and Comparative Endocrinology·G Csaba, J Bierbauer
Sep 1, 1973·Journal of Ultrastructure Research·R Elofsson, E Hallberg
Dec 1, 1973·The Journal of Experimental Zoology·W G Robison, J S Charlton
Jan 1, 1971·Zeitschrift für Zellforschung und mikroskopische Anatomie·P M AndrewsM Fingerman
Oct 1, 1966·The Journal of Endocrinology·L G Browman
Sep 1, 1966·Experimental Neurology·A VernadakisP S Timiras
Sep 10, 1966·Acta Crystallographica·E J Gabe, M R Taylor

Citations

Jun 27, 1979·Cell and Tissue Research·G PalladiniA Carolei
Mar 31, 2011·Journal of Biomedical Materials Research. Part a·P R UmashankarT V Kumari

Related Concepts

Metazoa
Chromatophore
Electron Microscopy
MSH Release-Inhibiting Hormone
Pigmentation
Dugesia
Turbellaria

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