Abstract
Abstract Recent studies have investigated the source and target neurons for the diffusible neuronal messenger molecule nitric oxide (NO) in the nervous system of the locust. Here we compare the neuroarchitecture of NO signaling between different sensory systems. The available neuroanatomical data implicate NO in sensory processing for modalities as diverse as mechanoreception, vision, olfaction, gustation and hearing. All respective first-order sensory neuropils are innervated by NOS-containing interneurons. The corresponding sensory receptor neurons lack NOS but seem to express soluble guanylyl cyclase (sGC), the main receptor molecule for NO in the nervous system. The axonal projections of sensory neurons must therefore be considered the primary target of NO in these sensory neuropils. An exception is the antennal olfactory system where sGC is apparently expressed in interneurons, in partial colocalization with NOS. We discuss these anatomical findings in relation to the spatiotemporal characteristics o...
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