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Neurological Laws

neurological laws

QuestionAnswer
Arndt's Law Weak stimuli excite physiological activity, moderately strong ones favor it, strong ones retard it and very strong ones arrest it
Davis's Law If muscle ends are brought closer together the pull of tonus is increased, thereby shortening the muscle, which may even cause hypertrophy. If the muscle ends are separated beyond normal, then tonus is lessened or lost, thereby weakening the muscle
Hiltons' Law A nerve trunk that supplies a joint also supplies the muscle of the joint and the skin over the insertions of such muscle.
Pfluger's Law Pain and Injury is 1.) progressive in nature and 2.)dependent on the degree of irritation to the nerve
Law of Unilaterality If a mild irritation is applied to one or more sensory nerves, then the movement takes place usually on one side only- the side that is irritated
Law of Symmetry If the stimulation is sufficiently increased, then motor reaction is exhibited not only by the irritated side but also in similar muscles in the opposite side of the body
Law of Intensity Reflex movements are usually more intense on the side of irritation. At times, the movements of the opposite side equal them in intensity, but are usually less pronounced
Law of Radiation If the excitation continues to increase, then it is propagated upward, and reaction take place through centrifugal nerves coming from the cord segments higher up.
Law of Generalization When the irritation becomes very intense, it is propagated in the medulla oblongata, which becomes a focus form which stimuli radiate to all parts of the cord, causing a general increase of tonus in all muscles of the body.
Sherrington's Law When a muscle receives a nerve impulse to contract, it's antagonist simultaneously receives an impulse to relax.
Law of Facilitation When an impulse has passed once through a certain set of neurons to the exclusion of others, it tends to take the same course on future occasions, and each time it traverses this path, the resistance is less.
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