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Synaptic organization of the cone horizontal cells in the catfish retina
Author(s) -
Sakai Hiroko M.,
Naka KenIchi
Publication year - 1986
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.902450108
Subject(s) - retina , biology , neuroscience , postsynaptic potential , axon , synapse , synaptic vesicle , catfish , anatomy , receptive field , biophysics , vesicle , membrane , fish <actinopterygii> , biochemistry , genetics , receptor , fishery
Horizontal cells of the vertebrate retina are known to contribute to the formation of the receptive fields surrounds photoreceptor and biopolar cells. However, few synapses have bee describe anatomically that might mediate these interactions. We have observed in the catfish retina that cone horizontal cell perikarya and dentrites make‐conventional chemical synapses onto photoreceptor terminal telodendria and, onto bipolar cell dendrites, while horizontal cell axon terminals make chemical synapses onto the perikarya and processes of amacrine cells. The synapses are characterized by clusters of round vesicles aggregated close to the site of contact, as well as by electron‐dense material associated with both pre‐ and postsynaptic membranes. The three kinds of synapses observed anatomically correspond to the synaptic pathways involving cone horizontal cells that have been suggested by the physiology of these cells.