Cell Types and Connectivity Patterns in Mosaic Retinas

di Hans-Joachim Wagner (Autore)

Springer-Verlag Berlin and Heidelberg GmbH & Co. KG, 1978

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.

• Autore: Hans-Joachim Wagner
• Editore: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
• Collana: Advances in Anatomy, Embryology and Cell Biology
• Anno: 1978
• Rilegatura: Paperback / softback
• Pagine: 84 p.
• Dimensioni: 235 x 155 mm
• EAN: 9783540090137

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