Receptor cells may exhibit a special kind of synapse, which on the presynaptic side, is characterized by numerous clear synaptic vesicles and a multilayered structure, the synaptic ribbon. Ribbon synapses of the retina occur in terminals of visual and bipolar cells. Quantitative assessment of these synapses showed no alterations of the number of synaptic vesicles in response to light or dark adaptation (Mountford, 1963; Cragg, 1972). In the present communication, attention is focused on the synaptic ribbons in the receptor cells of the retina. It will be shown that their number changes under different light conditions. An attempt is made to determine the factors leading to morphological alterations of the synaptic ribbons.
Bipolar Cell Dark Adaptation Constant Darkness Circadian Change Ribbon Synapse
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