Abstract
Immunocytochemistry has uncovered many populations of biochemically discrete neurons throughout the central and peripheral nervous systems. It seemed reasonable to assume that particular biochemical types of neuron would also share morphological and physiological properties, yet the evidence for this is still far from compelling. In the case of primary afferent fibres there are at least four major subgroups of unmyelinated sensory fibres, defined by their cytoplasmic content of various enzymes or peptides, and as many if not more types of receptive field profile. However, to date no direct correlation between physiological and biochemical subtypes has been made. Here we review the evidence for heterogeneity in the biochemical and physiological make-up of C-fibres and attempt to make some correlations.
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