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NADPH-diaphorase reactivity in ciliary ganglion neurons: A comparison of distributions in the pigeon, cat, and monkey

Published online by Cambridge University Press:  02 June 2009

Wensi Sun
Affiliation:
Department of Anatomy, University of Mississippi Medical Center, Jackson
Jonathan T. Erichsen
Affiliation:
Department of Neurobiology and Behavior, State University of New York at Stony Brook, Stony Brook
Paul J. May
Affiliation:
Department of Anatomy, University of Mississippi Medical Center, Jackson Department of Ophthalmology, University of Mississippi Medical Center, Jackson

Abstract

Ciliary ganglia from the pigeon, cat, and monkey were investigated for the presence of NADPH-diaphorase reactivity by use of a standard histochemical method. In the pigeon, where the ganglion is known to control lens and pupil function, and the choroidal vasculature, about one-third of the ganglion cells were densely stained and most other somata were lightly stained. In some cases, preganglionic terminals with a cap-like morphology were also darkly stained. The pattern of NADPH-diaphorase staining in mammals was very different from that seen in pigeons. In both mammalian species, where the ganglion is known to control lens and pupil function, a small number (less than 2%) of the ganglion cells were shown to be densely NADPH-diaphorase positive, revealing their neuronal processes. The presence of NADPH-diaphorase positive cells in pigeon, cat, and monkey ciliary ganglia suggests that nitric oxide may be used for intercellular communication in this ganglion, or in light of the known importance of nitric oxide in vascular control, some of these positive neurons may participate in the control of choroidal vasodilation.

Type
Short Communications
Copyright
Copyright © Cambridge University Press 1994

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