Handbook of Physiology for Students And Practitioners of Medicine
Handbook of Physiology for Students And Practitioners of Medicine
Austin Flint
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According to Setschenow, certain parts in the encephalon, particularly the optic lobes in frogs, exert an inhibi- tory influence over the reflex acts of the cord, and as a consequence, reflex phenomena are more marked when this influence has been removed. Certain poisons, especially strychnin, have a remarkable influence over reflex excitability. In a frog decapitated and poisoned with REFLEX ACTION OF THE SPINAL CORD 561 strychnin, no reflex movements occur unless an impression is made on the ...sensory nerves ; but a slight irritation, such as a current of air, throws the entire muscular system into a condition of violent tetanic spasm. The same phenomena are observed in cases of poisoning with strychnin or of tetanus in the human subject. The inhalation of anesthetic agents may abolish all the ordinary reflex phenomena. Whether this be due to an action on the cord itself or to a paralysis of the sensory nerves, it is difficult to determine. Ordinarily, in animals rendered insensible by anesthetics, the movements of respiration continue ; but these also may be arrested, as has been ob- served by all who have experimented with anesthetics, especially with chloroform.
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