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.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Palladini G,Medolago-Albani L,Margotta V,Conforti A,Carolei Adoi
10.1007/BF00236132subject
Has Abstractpub_date
1979-06-27 00:00:00pages
203-11issue
2eissn
0302-766Xissn
1432-0878journal_volume
199pub_type
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