LOCALIZATION OF THE MEDULLARY RESPIRATORY CENTERS IN THE MONKEY

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Abstract
Circumscribed electrical stimulation of the medullas of 14 monkeys by means of the Horsley-Clarke technic has revealed the existence of 2 discrete regions, from one of which sustained inspiratory apnea, from the other sustained expiratory apnea were consistently obtained. The inspiratory field is located dorsally and medially to the rostral half of the inferior olive. The expiratory field surrounds the inspiratory, lying rostrally, caudally, laterally and to some extent dorsally to the latter. Successive decreases in stimulus strength down to threshold values did not change the character or topographical arrangement of the responses. The anatomical localization is in general agreement with that found previously for the cat. In 2 monkeys with pontile hemisections, there was no diminution of reaction as compared with normal animals nor any difference in the responses obtained from the 2 sides of the medulla.

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