A text-book of physiology, for medical students and physicians . d thus at thesame time give origin to involuntary and even unconscious re-flexes. Painful stimulation of the skin, for example, may giveus a conscious sensation of pain and at the same time reflexlystimulate the vasomotor center and cause a constriction of thesmall arteries. The fact that in this case two distinct events occurdoes not necessitate the assumption that the impulses from the 144 PHYSIOLOGY OF CENTKAL NERVOUS SYSTEM. skin are carried to the cord by two different varieties of may well be that one variety of s
A text-book of physiology, for medical students and physicians . d thus at thesame time give origin to involuntary and even unconscious re-flexes. Painful stimulation of the skin, for example, may giveus a conscious sensation of pain and at the same time reflexlystimulate the vasomotor center and cause a constriction of thesmall arteries. The fact that in this case two distinct events occurdoes not necessitate the assumption that the impulses from the 144 PHYSIOLOGY OF CENTKAL NERVOUS SYSTEM. skin are carried to the cord by two different varieties of may well be that one variety of sensory neuron, the so-calledpain fibers, effects both results, because of the opportunities inthe cord for connections with different groups of nerve cells. The Reflex Frog.—The motor reflexes from the spinal cordcan be studied most successfully upon a frog in which the brainhas been destroyed or whose head has been cut off. After suchan operation the animal may for a time suffer from shock, buta vigorous animal will usually recover and after some hours will.
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