Quantitative studies of retinal ganglion cells in a turtle,Pseudemys scripta elegans: II. Size spectrum of ganglion cells and its regional variation
- 20 June 1982
- journal article
- research article
- Published by Wiley in Journal of Comparative Neurology
- Vol. 208 (2) , 157-168
- https://doi.org/10.1002/cne.902080205
Abstract
Recent evidence suggests that ganglion cell size and its regional variation may be an important feature of vertebrate retinas. Accordingly, we have examined Nissl-stained, whole-mounted Pseudemys scripta retinas to determine the soma size spectrum of ganglion cells at different retinal loci. Cell size histograms reveal that at any given point on the retina, a majority of ganglion cells are small (6–10 μm), and in peripheral samples there is some evidence for a second, larger size class (12–15 μm). Comparison of samples along the dorsoventral and nasotemporal axes suggests that there are two major trends in soma size variation. Along the dorsoventral axis, ganglion cell diameter increases sharply from the visual streak (6–7 μm, cf. Peterson and Ulinski, 1979) to the dorsal and ventral periphery (9–10 μm). These changes reflect a tendency towards increased size for the entire distribution as well as a relative decrease in the frequency of small ganglion cells. This soma size variation is significantly correlated with changes in ganglion cell density. Along the nasotemporal axis, temporal ganglion cells are significantly larger than those at more nasal retinal loci. This differences reflects an overall increase in the size of ganglion cells in temporal retina and a small but significant increase in the percentage of neurons larger than 15 μm.This publication has 44 references indexed in Scilit:
- The potential binocular field and its tectal representation inrana pipiensJournal of Comparative Neurology, 1980
- Light responses of ganglion cells in the retina of the turtleThe Journal of Physiology, 1980
- Properties of concentrically organized X and Y ganglion cells of macaque retinaJournal of Neurophysiology, 1978
- The number and distribution of ganglion cells in the retina of the brush-tailed possum,Trichosurus vulpeculaJournal of Comparative Neurology, 1978
- Transmission from photoreceptors to ganglion cells in turtle retinaThe Journal of Physiology, 1977
- A three-group classification of rat retinal ganglion cells: histological and physiological studiesBrain Research, 1977
- Interactions between Cones and Second-Order Neurons in the Turtle RetinaProceedings in Life Sciences, 1976
- Interactions and Feedbacks in the Turtle RetinaProceedings in Life Sciences, 1976
- The morphological types of ganglion cells of the domestic cat's retinaThe Journal of Physiology, 1974
- Parallels in the Visual Afferent Projections of the Thalamus in the Hedgehog (Paraechinus hypomelas) and the Turtle (Pseudemys scripta)Brain, Behavior and Evolution, 1970