Opposite pupillary size effects in the cat and dog after microinjections of morphine, normorphine and clonidine in the Edinger-Westphal nucleus

The Edinger-Westphal complex (EW) was explored as a possible site of action for the effects of morphine and clonidine to produce mydriasis in the cat and miosis in the dog. Morphine, normorphine and clonidine, dissolved in 0.5 μl 0.9% NaCl, were injected via chronic indwelling cannulae into or near...

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