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. 2012 Jan 19;302(7):G676–G683. doi: 10.1152/ajpgi.00490.2011

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Fig. 4. — Classes of pelvic nerve afferent colorectal endings. Afferent endings were identified by electrical stimulation (e-stim; arrows indicate stimulus artifacts) and classified based on responses to mechanical stimuli. Mechanically insensitive afferents (MIAs) do not respond to mechanical stimuli. All four classes of mechanosensitive endings responded to probing (0.4–1.4 g). Muscular/mucosal (mus/mucos) endings also responded to mucosal stroking (10 mg) and circumferential stretch (0–170 mN). Muscular (mus) endings also responded to stretch, and mucosal (mucos) endings also responded to stroking. Serosal endings did not respond to either stroking or stretch.