Abstract

The electron microscope study of the retina of rats revealed the presence of granulated vesicles in synapses and neurons. Of the three different types of nerve endings observed in the inner plexiform layer, two were found to contain granulated vesicles. Type 1 nerve ending, belonging to bipolar cells, is devoid of granulated vesicles and together with type 2 nerve endings and ganglion cell dendrites forms glomerular-like synapses. Type 2 nerve endings, belonging to amacrine cells, have granulated vesicles of 640 A, and type 3 nerve endings, probably representing centrifugal fibers and located at the outermost zone of the inner plexiform layer, have granulated vesicles of 1140 A.

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