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These PAG\u2010NRA\u2010motoneuronal projections are thought to play a role in survival behaviors, such as vocalization and mating behavior. In the present combined antero\u2010 and retrograde tracing study in the cat, we sought to determine whether the NRA, apart from the neurons projecting to motoneurons, also contains cells projecting back to the PAG. After injections of WGA\u2010HRP in the caudal and intermediate PAG, labeled neurons were observed in the NRA, with a slight contralateral preponderance. In contrast, after injections in the rostral PAG or adjacent deep tectal layers, no or very few labeled neurons were present in the NRA. After injection of [<jats:sup>3<\/jats:sup>H]leucine in the NRA, anterograde labeling was present in the most caudal ventrolateral and dorsolateral PAG, and slightly more rostrally in the lateral PAG, mainly contralaterally. When the [<jats:sup>3<\/jats:sup>H]leucine injection site extended medially into the medullary lateral tegmental field, labeling was found in most parts of the PAG as well as in the adjoining deep tectal layers. No labeled fibers were found in the dorsolateral PAG, and only a few were found in the rostral PAG. Because the termination pattern of the NRA fibers in the PAG overlaps with that of the sacral cord projections to the PAG, it is suggested that the NRA\u2010PAG projections play a role in the control of motor functions related to mating behavior. J. Comp. Neurol. 445:47\u201358, 2002. \u00a9 2002 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/cne.10151","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T23:09:26Z","timestamp":1030316966000},"page":"47-58","source":"Crossref","is-referenced-by-count":13,"title":["Nucleus retroambiguus projections to the periaqueductal gray in the cat"],"prefix":"10.1002","volume":"445","author":[{"given":"Esther\u2010Marije","family":"Klop","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonora 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