[Conduction velocity and excitability of A and C fibers of the mesenteric nerve in the cat].

Conduction velocity and electrical excitability of mesenteric nerve fibres were studied in experiments on cats. These nerves were shown to consist of: 1) fibres with an excitation threshold of 0.06-0.10 V (stimuli duration being 0.1 ms) and with maximum conduction velocity of 48-85 m/s; 2) fibres with a threshold of 0.3-0.7 V and with conduction velocity from 8-10 to 33-39 7/s; 3) fibres with a threshold above 1 V and with conduction velocity from 1.8 to 7 m/s; 4) fibres with a threshold 6-8 V and conduction velocity below 1.8 m/s. The fibres of the first three groups are the afferent A-fibres. According to conduction velocity and wave amplitude in the compound action potential the fibres of the last group are divided into three subgroups. The first and third subgroups are shown to consist of afferent C-fibres; the second subgroup - of both afferent and postganglionic sympathetic C-fibres.