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a reflexive reaction that proceeds—in contrast to a genuine reflex—without the participation of central nervous mechanisms. In the axon reflex, excitation arising in the peripheral nerve ending is transferred at the branching point of the afferent fiber from one branch to another, producing a definite physiological effect. Dilatation of peripheral blood vessels when the skin is irritated may serve as an example of the axon reflex. Reactions of the axon reflex type were first observed by N. M. Sokovnin in 1873 in the urinary bladder of a cat. In 1893 they were described by the English physiologist J. N. Langley, who called them axon reflexes.
G. N. KASSIL’