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Electrophysiological Properties of Cells in the Median Ocellus of Limulus

Two types of photoreceptors are found in the median ocellus of Limulus. One type is maximally sensitive to ultraviolet (UV) light, the other to green light; they are called UV and VIS cells, respectively. Biphasic receptor potentials, consisting of a small initial hyperpolarizing phase and a later s...

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Detalles Bibliográficos
Autores principales: Nolte, John, Brown, Joel E.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1972
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203167/
https://www.ncbi.nlm.nih.gov/pubmed/5058473
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author Nolte, John
Brown, Joel E.
author_facet Nolte, John
Brown, Joel E.
author_sort Nolte, John
collection PubMed
description Two types of photoreceptors are found in the median ocellus of Limulus. One type is maximally sensitive to ultraviolet (UV) light, the other to green light; they are called UV and VIS cells, respectively. Biphasic receptor potentials, consisting of a small initial hyperpolarizing phase and a later slow depolarizing phase, can be recorded from both receptor types. These biphasic responses are elicited in UV cells in response to long-wavelength light, and in VIS cells in response to ultraviolet light. Another type of hyperpolarizing response can be recorded in UV cells: after a bright ultraviolet stimulus, the cell remains depolarized; long-wavelength light rapidly returns the membrane potential to its value preceding ultraviolet illumination (this long-wavelength-induced potential change is called a "repolarizing response"). Also, a long-wavelength stimulus superimposed during a UV stimulus elicits a sustained repolarizing response. A third cell type (arhabdomeric cell) found in the median ocellus generates large action potentials and is maximally sensitive to UV light. Biphasic responses and repolarizing responses also can be recorded from arhabdomeric cells. The retina is divided into groups of cells; both UV cells and VIS cells can occur in the same group. UV cells in the same group are electrically coupled to one another and to an arhabdomeric cell.
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spelling pubmed-22031672008-04-23 Electrophysiological Properties of Cells in the Median Ocellus of Limulus Nolte, John Brown, Joel E. J Gen Physiol Article Two types of photoreceptors are found in the median ocellus of Limulus. One type is maximally sensitive to ultraviolet (UV) light, the other to green light; they are called UV and VIS cells, respectively. Biphasic receptor potentials, consisting of a small initial hyperpolarizing phase and a later slow depolarizing phase, can be recorded from both receptor types. These biphasic responses are elicited in UV cells in response to long-wavelength light, and in VIS cells in response to ultraviolet light. Another type of hyperpolarizing response can be recorded in UV cells: after a bright ultraviolet stimulus, the cell remains depolarized; long-wavelength light rapidly returns the membrane potential to its value preceding ultraviolet illumination (this long-wavelength-induced potential change is called a "repolarizing response"). Also, a long-wavelength stimulus superimposed during a UV stimulus elicits a sustained repolarizing response. A third cell type (arhabdomeric cell) found in the median ocellus generates large action potentials and is maximally sensitive to UV light. Biphasic responses and repolarizing responses also can be recorded from arhabdomeric cells. The retina is divided into groups of cells; both UV cells and VIS cells can occur in the same group. UV cells in the same group are electrically coupled to one another and to an arhabdomeric cell. The Rockefeller University Press 1972-02-01 /pmc/articles/PMC2203167/ /pubmed/5058473 Text en Copyright © 1972 by The Rockefeller University Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Nolte, John
Brown, Joel E.
Electrophysiological Properties of Cells in the Median Ocellus of Limulus
title Electrophysiological Properties of Cells in the Median Ocellus of Limulus
title_full Electrophysiological Properties of Cells in the Median Ocellus of Limulus
title_fullStr Electrophysiological Properties of Cells in the Median Ocellus of Limulus
title_full_unstemmed Electrophysiological Properties of Cells in the Median Ocellus of Limulus
title_short Electrophysiological Properties of Cells in the Median Ocellus of Limulus
title_sort electrophysiological properties of cells in the median ocellus of limulus
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203167/
https://www.ncbi.nlm.nih.gov/pubmed/5058473
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