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Table of contents

  1. Front Matter
    Pages N1-8
  2. H.-J. Wagner
    Pages 9-10
  3. H.-J. Wagner
    Pages 10-13
  4. H.-J. Wagner
    Pages 13-70
  5. H.-J. Wagner
    Pages 70-71
  6. H.-J. Wagner
    Pages 72-73
  7. H.-J. Wagner
    Pages 74-79
  8. Back Matter
    Pages 80-84

About this book

Introduction

In many parts of vertebrate and invertebrate central nervous systems, groups of nerve or receptor cells can be found that are arranged and connected according to a precise, functionally defined pattern (Braitenberg, 1973; Santini, 1975; Strausfeld, 1976; Chan-Palay, 1977). In these cases, groups of cell bodies or synapses appear as basically similar configurations, which, however, are different in detail from each other. Such abstract patterns of connectivity are of a statistical nature and do not allow, in a given example, for the prediction of the localization or connections of a particular cell. "Wiring diagrams", therefore, can be obtained only from a multitude of individual observations. In contrast, in several sensory organs, concrete patterns occur that con­ sist of a regular, mosaic-like, and geometric arrangement of similar cell types. The constancy of such a mosaic allows predictions about certain units of the pattern on the basis of only a few exemplary observations. Typical examples are found in the visual system: In the compound eye of insects, each ommatidium contains a definite number of visual cells that are grouped around the optical axis in a hexogonal array (Kirsch­ feld, 1967); in the vertebrate retina, mosaics of geometrically arranged cones are found most frequently in lower vertebrates; they are common among teleosts. A number of studies have dealt with their phylogenetic significance and their functional role as adaptation to specific environments or modes of feeding.

Keywords

adaptation cell electron microscopy environment histology insects invertebrates microscopy morphology nervous system

Authors and affiliations

  • H.-J. Wagner
    • 1
  1. 1.Abteilung für Klinische MorphologieUniversität UlmUlmFederal Republic of Germany

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-642-67071-8
  • Copyright Information Springer-Verlag Berlin Heidelberg 1978
  • Publisher Name Springer, Berlin, Heidelberg
  • eBook Packages Springer Book Archive
  • Print ISBN 978-3-540-09013-7
  • Online ISBN 978-3-642-67071-8
  • Series Print ISSN 0301-5556
  • Series Online ISSN 2192-7065
  • Buy this book on publisher's site