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Example of a mechanically insensitive (silent) pelvic nerve sensory fibre. Before intracolonic instillation of the C fibre excitant mustard oil, this fibre did not respond to 100 mm Hg colonic distension (CRD) (not shown). After mustard oil treatment, the fibre began to discharge and acquired sensitivity to CRD. (Modified from Sengupta and Gebhart.1)
