ON THE INFLUENCE OF ANOXIA ON PUPILLARY REFLEXES IN THE RABBIT

Publisher Website
Google Scholar
Abstract
Expts. are reported in rabbits on the influence of stimulation of the sciatic with weak faradic currents on the reflex pupillary dilatation. 6-8% O inhaled for a period of 20 min. increases considerably the threshold for the reflex dilatation. The reaction is reversible on adm. of air, and is identical in the sympathectomized and normal eye. The simultaneous inhalation of 4% CO2 prevents the effects of anoxia. Expts. on atropinized eyes fail to show effects of reflex stimulation. Adrenalin secretion occurs only with much more intense and prolonged stimuli than were used in this investigation. The pupillary reflex studied in this paper involves only the inhibition of the parasympathetic.