Die entwicklung der netzhaut von Nannacara anomala (Regan) (Cichlidae, Teleostei) mit besonderer Berücksichtigung regionaler Differenzierungsunterschiede View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1974-06

AUTHORS

Hans-Joachim Wagner

ABSTRACT

The diameter of the eyes of Nannacara anomala increases faster than the length of the body until the 5th–10th day after hatching; after this time the growth of the eyes is negatively allometric.The overall thickness of the retina is greatest in the temporal region of the eye for the complete period of development; it decreases toward the dorsal, central, and nasal parts and is least thick in the ventral sector. The same is true for the regional differences in the quantitative distribution of the various retinal cell classes. This means that a so-called “area” exists in the mediotemporal part of the eye of Nannacara anomala.During development the number of receptor cells per unit area increases to twice its original value, whereas the number of ganglion cells decreases by a half.The average ratio of the different cell classes of the adult retina is: 2 (receptor cells): 0.5 (horizontal cells): 2 (bipolar cells): 2 (amacrine cells): 1 (ganglion cell).In the “area” the density of the population of visual cells is 30% higher than in the periphery of the retina.When the larvae start to swim freely (5th day) there are two completely differenciated cone types (single and identical double cones) in the “area” which are arranged in a square pattern. Functioning rods are not found until the 16th day after hatching.The retinomotor response of single cones and rods can be observed after the 16th day.A temporal sequence of 6 different stages in the development of the visual cells is distinguished in the fundus of the eye. At a certain age the same stages are found as a spatial sequence in the peripheral zones of additional growth.The extent of the growth zones corresponding to the different stages of differenciation of the receptor cells during the course of the development of the eye is studied in reconstructions of serial sections. The growth of the visual cells is most advanced in the mediotemporal “area” and most delayed in the ventral part of the retina.The regional differences in the development of the retina are discussed with respect to ethological and sensory-physiological findings in young Nannacara. More... »

PAGES

113-131

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00298778

DOI

http://dx.doi.org/10.1007/bf00298778

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047523480


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