VARIABILITY OF LIGHT-EVOKED RESPONSE PATTERN AND MORPHOLOGICAL CHARACTERIZATION OF AMACRINE CELLS IN GOLDFISH RETINA

被引:21
作者
DJAMGOZ, MBA [1 ]
SPADAVECCHIA, L [1 ]
USAI, C [1 ]
VALLERGA, S [1 ]
机构
[1] CNR, IST CIBERNET & BIOFIS, I-16146 GENOA, ITALY
基金
英国惠康基金;
关键词
colour‐coding; distant dendrites; goldfish; inner plexiform layer; retina; sustained; transient;
D O I
10.1002/cne.903010204
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Amacrine cells of the goldfish retina were characterized electrophysiologically and subsequently labelled by intracellular injection of horseradish peroxidase. An attempt was made to broaden the electrophysiological classification of the cells. Light‐evoked sustained amacrice cell responses were divided into two subtypes depending on colour opponency. Colour‐coded responses (red/depolarizing and green/hyperpolarizing) were found to arise in amacrine cells possessing highly polarized dendritic fields; the dendrites were monostratified in the proximal half (sublamina b) of the inner plexiform layer. Non‐colour‐opponent sustained responses also arose in monostratified units, but the level of dendritic ramification was in sublamina a or b (hyperpolarizing or depolarizing units, respectively). Transient (ON‐OFF) responses were associated mainly with bi‐ or multi‐stratified or diffuse amacrine cells. Some variability was observed in the sizes of the dendritic fields in different sublaminae. There was a tendency for units with brisk components of responses to be narrowly stratified in the inner plexiform layer. Some units possessed “distant” dendrites. Several aspects of structure‐function correlation in amacrine cells are discussed. Copyright © 1990 Wiley‐Liss, Inc.
引用
收藏
页码:171 / 190
页数:20
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