Afferent nerve groups and sympathetic reflex pathways

摘要: Summary In chloralose-anesthetized cats, two reflex sympathetic discharges were recorded from lumbar white rami after single shock stimulation of peripheral afferent nerves: an early discharge associated with a spinal pathway, and late supraspinal pathway. The following relationship between fibers pathways noted: (1) Excitation only Group I hindlimb muscle did not evoke discharges. (2) II plus fibers, or Aα Aβ hind- forelimb cutaneous, visceral evoked the reflex. Beyond its threshold response increased stimulus strength. (3) Stimulus strengths greater than for III muscle, Aδ (4) Supraspinal reflexes present in all fore- studies. Spinal consistently found nerve studies but one out four (5) Stimuli strong enough to excite C often caused increases discharge. Such might be due C-fiber activated pathway (6) Strychnine tetanic nerves led amplitudes both responses succeeding shocks. (7) Stimulation cutaneous chronic cats. smaller amplitude this