TY - JOUR
T1 - Electrical coupling, receptive fields, and relative rod/cone inputs of horizontal cells in the tiger salamander retina
AU - Zhang, Ai Jun
AU - Zhang, Jian
AU - Wu, Samuel M.
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2006/11/20
Y1 - 2006/11/20
N2 - Light responses, dendritic/axonal morphology, receptive field diameters, patterns of dye coupling, and relative rod/cone inputs of various types of horizontal cells (HCs) were studied using intracellular recording and Lucifer yellow/neurobiotin dye injection methods in the flatmount tiger salamander retina. Three physiologically and morphologically distinct types of HC entities were identified. 1) The A-type HCs are somas that do not bear axons, with average (±SE) soma diameters of 20.01 ± 0.59 μm, relatively sparse and thick dendrites, and they resemble the A-type HC in mammals. The average receptive field diameter of these cells is 529.6 ± 10.87 μm and they receive inputs predominantly from cones. 2) The B-type HCs are broad-field somas that bear thin and long axons, with average soma diameters of 17.67 ± 0.38 μm, thinner dendrites of higher density, and they resemble the B-type HC in mammals. The average receptive field diameter of these cells is 1,633.55 ± 37.34 μm and they receive mixed inputs from rods and cones. 3) The B-type HC axon terminals are broad-field, coarse axon terminal processes and they resemble the B-type HC axon terminal in rabbits. The average receptive field diameter of these axon terminals is 1,291.67 ± 24.02 μm and they receive mixed inputs from rods and cones. All these types of HC are dye-coupled with adjacent HCs of the same type. Additionally, B-type HCs and axon terminals are dye-coupled with subpopulations of bipolar cells whose axon terminals ramify in the proximal half of the inner plexiform layer, raising the possibility that these HCs may send feedforward antagonistic surround responses to depolarizing bipolar cells through electrical synapses.
AB - Light responses, dendritic/axonal morphology, receptive field diameters, patterns of dye coupling, and relative rod/cone inputs of various types of horizontal cells (HCs) were studied using intracellular recording and Lucifer yellow/neurobiotin dye injection methods in the flatmount tiger salamander retina. Three physiologically and morphologically distinct types of HC entities were identified. 1) The A-type HCs are somas that do not bear axons, with average (±SE) soma diameters of 20.01 ± 0.59 μm, relatively sparse and thick dendrites, and they resemble the A-type HC in mammals. The average receptive field diameter of these cells is 529.6 ± 10.87 μm and they receive inputs predominantly from cones. 2) The B-type HCs are broad-field somas that bear thin and long axons, with average soma diameters of 17.67 ± 0.38 μm, thinner dendrites of higher density, and they resemble the B-type HC in mammals. The average receptive field diameter of these cells is 1,633.55 ± 37.34 μm and they receive mixed inputs from rods and cones. 3) The B-type HC axon terminals are broad-field, coarse axon terminal processes and they resemble the B-type HC axon terminal in rabbits. The average receptive field diameter of these axon terminals is 1,291.67 ± 24.02 μm and they receive mixed inputs from rods and cones. All these types of HC are dye-coupled with adjacent HCs of the same type. Additionally, B-type HCs and axon terminals are dye-coupled with subpopulations of bipolar cells whose axon terminals ramify in the proximal half of the inner plexiform layer, raising the possibility that these HCs may send feedforward antagonistic surround responses to depolarizing bipolar cells through electrical synapses.
KW - Amphibian retina
KW - Axon terminals
KW - Dye coupling
KW - Horizontal cells
KW - Narrow field and broad field HCs
KW - Receptive fields
KW - Rod and cone inputs
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U2 - 10.1002/cne.21117
DO - 10.1002/cne.21117
M3 - Article
C2 - 16998920
AN - SCOPUS:33750034056
SN - 0021-9967
VL - 499
SP - 422
EP - 431
JO - Journal of Comparative Neurology
JF - Journal of Comparative Neurology
IS - 3
ER -