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Vol. 22, No. 4, 1983
Issue release date: 1983
Section title: Paper
Brain Behav Evol 1983;22:175–184
(DOI:10.1159/000121516)

Topographical Organisation of the Retina in a Monotreme: Australian Spiny Anteater Tachyglossus aculeatus

Stone J.
School of Anatomy, University of New South Wales, Sydney, Australia

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Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: 3/18/2008
Issue release date: 1983

Number of Print Pages: 10
Number of Figures: 0
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE

Abstract

The topography of the ganglion cell layer of the retina has been examined in the spiny anteater or echidna, Tachyglossus aculeatus. The retina measures about 70 mm2 in area and contains approximately 60,000 ganglion cells. The somas of the cells do not form distinct size groupings, as they do in other mammals, where the size groupings are related to functional differences. There is only a weak gradient in the density of ganglion cells between central and peripheral regions of the retina. In particular, there is no sign of a localised concentration of cells, such as at the fovea or area centralis of other species, and only very weak evidence of a visual streak. There is thus very little regional variation in the structure of the echidna retina, less than in any mammal previously studied. Implications for the understanding of comparative retinal topography are discussed.

© 1983 S. Karger AG, Basel


  

Author Contacts

Dr. J. Stone, School of Anatomy, University of New South Wales, PO Box 1, Kensington, NSW 2033 (Australia)

  

Article Information

Published online: March 18, 2008
Number of Print Pages : 10

  

Publication Details

Brain, Behavior and Evolution

Vol. 22, No. 4, Year 1983 (Cover Date: 1983)

Journal Editor: Wilczynski W. (Atlanta, Ga.)
ISSN: 0006–8977 (Print), eISSN: 1421–9743 (Online)

For additional information: http://www.karger.com/BBE


Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: 3/18/2008
Issue release date: 1983

Number of Print Pages: 10
Number of Figures: 0
Number of Tables: 0

ISSN: 0006-8977 (Print)
eISSN: 1421-9743 (Online)

For additional information: http://www.karger.com/BBE


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