Activités des rosettes ciliées et leurs supports ultrastructuraux chez les Cténaires

  title={Activit{\'e}s des rosettes cili{\'e}es et leurs supports ultrastructuraux chez les Ct{\'e}naires},
  author={J. Franc},
  journal={Zeitschrift f{\"u}r Zellforschung und Mikroskopische Anatomie},
  • J. Franc
  • Published 2004
  • Biology
  • Zeitschrift für Zellforschung und Mikroskopische Anatomie
SummaryExcretion and hydrostatic regulation of the Ctenophores depend on a particular set of special structures: the ciliated cell rosettes of the endodermal gastrovascular system.The peculiarity of these cell rosettes lies in a free communication between the mesoglea and the lumen of gastrovascular canals. Rapid liquid currents, without ionic discernment, are carried through this hole. The direction of these currents is determined by the beating of the only flagellar tuft borne by the upper… 

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Phylogenetic relationships of rotifers, as derived from photoreceptor morphology and other ultrastructural analyses

Not one argument corroborates Remane's hypothesis of the coelomate origin of rotifers, and several aspects of their ultrastructural morphology suggest more relationships to the Acanthocephala and Platyhelminths than to the other classes of Aschelminths.

A non-bilaterian perspective on the development and evolution of animal digestive systems

An overview of the development and cell biology of digestive tissues in non-bilaterian animals is compiled, and the fundamental differences between extracellular and intracellular digestive processes are highlighted, and how these are distributed among animals.

Phagocytosis in cellular defense and nutrition: a food-centered approach to the evolution of macrophages

In this review, a brief overview of the enteric phagocytes described electron microscopically for diverse invertebrate clades is provided, to compare these cells with the “canonical” phagocyte ultrastructure established for macrophages and to consider the deep evolutionary relationship between the two cell types.

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The sections in this article are Protozoa and Parazoa, Heart and Vascular Performance, Arthropods, Insects, and Conclusion.



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The general histological organization of Hydra is reviewed and electron microscopic observations are presented which bear upon the nature of the mesoglea, the mode of attachment of the contractile

Coated vesicles in absorptive cells of Hydra.

The apical cytoplasm of absorptive cells in hydra gastroderm contains numerous vesicles having a discoidal shape, an asymmetrical membrane and a peculiar coat firmly attached to the luminal surface

Differentiation of neurosensory cells in Hydra.

  • L. Davis
  • Biology
    Journal of cell science
  • 1969
The differentiation of neurosensory cells in Hydra has been studied at the level of the electron microscope and there is no evidence to suggest that neuros Sensory cells represent a stage in the development of other nerve cells, i.e. ganglionic and neurosecretory cells.

The Occurrence of Intercellular Bridges in Groups of Cells Exhibiting Synchronous Differentiation

The discovery of intercellular bridges in the two unrelated tissues discussed here suggests that a similar syncytial relationship may be found elsewhere in nature where groups of cells of common origin differentiate synchronously.


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A histological and ultrastructural study of germinal differentiation of interstitial cells arising from gland cells in Hydra viridis

It is concluded that in Hydra there is no specific germinal cell line determined during embryogeny, and that a somatic cell under proper environmental conditions can be induced to undergo meiosis.

Ionic and osmoregulation in the fresh-water medusa, Craspedacusta sowberyi.

Sulphate regulation in jellyfish