The pigmentary system of planaria |
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| Authors: | Prof. Guido Palladini Lodovico Medolago-Albani Vito Margotta Alberto Conforti Antonio Carolei |
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| Affiliation: | (1) Istituto di Biologia Generale I (Facoltà di Medicina), University of Rome, Italy;(2) Istituto di Anatomia Comparata (Facoltà di Scienze), University of Rome, Italy;(3) Istituto di Patologia Generale (Facoltà di Medicina), University of Rome, Italy;(4) I Clinica Neurologica (Facoltà di Medicina), University of Rome, Italy;(5) Facoltà di Medicina, Istituto di Biologia Generale I, Policlinico Umberto I, 1-00100 Roma, Italy |
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| Abstract: | Summary 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. |
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| Keywords: | Pigmentary system Planaria |
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