Dual actions of isthmic input to tectal neurons in a reptile, Gekko gekko

Stephen A. George, Gang Yi Wu, Wen Chang Li, Shu Rong Wang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We analyzed postsynaptic potentials and dye-labeled morphology of tectal neurons responding to electrical stimulation of the optic nerve and of the nucleus isthmi in a reptile, Gekko gekko, in order to compare with previously reported interactions between the optic rectum and the nucleus isthmi in amphibians and birds. The results indicate that isthmic stimulation exerts inhibitory and excitatory actions on rectal cells, similar to dual isthmotectal actions in amphibians, it appears that dual actions of the isthmotectal pathway in amphibians and reptiles are shared by two subdivisions of the nucleus isthmi in birds. The morphology of tectal cells responding to isthmic stimulation is generally similar to that of tectoisthmic projecting neurons, but they differ particularly in that some tectoisthmic cells bear numerous varicosities whereas cells receiving isthmic afferents do not. Thus, it is likely that at least some tectoisthmic cells may not be in the population of tectal cells that can be affected by isthmic stimulation. Forty-four percent of injections resulted in dye-coupled labeling, suggesting extensive electrical connections between rectal cells in reptiles.

Original languageEnglish (US)
Pages (from-to)889-893
Number of pages5
JournalVisual Neuroscience
Volume16
Issue number5
DOIs
StatePublished - Sep 1 1999

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Reptiles
Neurons
Amphibians
Birds
Coloring Agents
Synaptic Potentials
Optic Nerve
Rectum
Electric Stimulation
Injections
Population

All Science Journal Classification (ASJC) codes

  • Physiology
  • Sensory Systems

Cite this

George, Stephen A. ; Wu, Gang Yi ; Li, Wen Chang ; Wang, Shu Rong. / Dual actions of isthmic input to tectal neurons in a reptile, Gekko gekko. In: Visual Neuroscience. 1999 ; Vol. 16, No. 5. pp. 889-893.
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Dual actions of isthmic input to tectal neurons in a reptile, Gekko gekko. / George, Stephen A.; Wu, Gang Yi; Li, Wen Chang; Wang, Shu Rong.

In: Visual Neuroscience, Vol. 16, No. 5, 01.09.1999, p. 889-893.

Research output: Contribution to journalArticle

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