The eel retina. Receptor classes and spectral mechanisms

J. Gordon, Robert Shapley, E. Kaplan

Research output: Contribution to journalArticle

Abstract

Light and electron microscopy revealed that there are both rods and cones in the retina of the eel Anguilla rostrata. The rods predominate with a rod to cone ratio of 150:1. The spectral sensitivity of the dark-adapted eyecup ERG had a peak at about 520 nm and was well fit by a vitamin A2 nomogram pigment with a λ(max) = 520 nm. This agrees with the eel photopigment measurements of other investigators. This result implies that a single spectral mechanism - the rods- provides the input for the dark-adapted ERG. The spectral sensitivity of the ERG to flicker in the light-adapted eyecup preparation was shifted to longer wavelengths; it peaked at around 550 nm. However, there was evidence that this technique might not have completely eliminated rod intrusion. Rod responses were abolished in a bleached isolated retina preparation, in which it was shown that there were two classes of cone-like mechanisms, one with λ(max) of 550 nm and the other with λ(max) of <450 nm. Ganglion cell recording provided preliminary evidence for opponent-color processing. Horizontal cells were only of the L type with both rod and cone inputs.

Original languageEnglish (US)
Pages (from-to)123-138
Number of pages16
JournalJournal of General Physiology
Volume71
Issue number2
StatePublished - 1978

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Eels
Vertebrate Photoreceptor Cells
Retina
Anguilla
Retinal Cone Photoreceptor Cells
Light
Nomograms
Ganglia
Electron Microscopy
Color
Research Personnel

ASJC Scopus subject areas

  • Physiology

Cite this

The eel retina. Receptor classes and spectral mechanisms. / Gordon, J.; Shapley, Robert; Kaplan, E.

In: Journal of General Physiology, Vol. 71, No. 2, 1978, p. 123-138.

Research output: Contribution to journalArticle

Gordon, J. ; Shapley, Robert ; Kaplan, E. / The eel retina. Receptor classes and spectral mechanisms. In: Journal of General Physiology. 1978 ; Vol. 71, No. 2. pp. 123-138.
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