Abstract
This chapter discusses why S–F hypothesis is criticized by some researchers. There are several schools of investigators who are skeptical on S–F hypothesis of synapses in the nervous system. Morales and Duncan (1968) reported that they could not find any difference in shape and size of synaptic vesicles that would serve to distinguish any of the synapses in the cortex and deep nuclei of the Syrian Hamster cerebellum. One study recognized the statistical difference of vesicle size at different locations in the hamster's cerebellum but failed to classify the synapses in different types by inspection. According to this study, the vesicle size difference is too small to be convincing of the difference of synapses. It was concluded that the morphological difference of synaptic vesicles is inadequate to be adopted be a criteria for distinguishing the synapses into different types.
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