REFLEX MUSCULAR RESPONSES TO STIMULATION OF ARTICULAR NERVES IN THE CAT

Abstract

Reflex functions of articular nerves were studied in decerebrate and decapitate animals. Simultaneous stimulation of all the fibers in articular nerves usually resulted in withdrawal and, in decerebrate animals, in crossed extension as well. These reflexes represent responses to nociceptive stimuli since they were best developed only when nonmyelinated and small myelinated fibers were activated. The larger myelinated fibers in articular nerves arise from Ruffini-type endings and stimulation of just these fibers in decapitate animals was followed by multineuron arc discharges to flexor muscles. Responses in decerebrate animals were variable and often absent. It is suggested that the larger articular fibers and their central connections may subserve phasic mechanisms, such as locomotion.