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

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 Res

journal_title

Cell and tissue research

authors

Palladini G,Medolago-Albani L,Margotta V,Conforti A,Carolei A

doi

10.1007/BF00236132

subject

Has Abstract

pub_date

1979-06-27 00:00:00

pages

203-11

issue

2

eissn

0302-766X

issn

1432-0878

journal_volume

199

pub_type

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