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Following HRP injections in the spinal cord of <jats:italic>Scyliorhinus<\/jats:italic> (fourth to sixth segment) and of <jats:italic>Raja<\/jats:italic> (15th to 20th segment) labeled neurons could be identified in the rhombencephalon, the mesencephalon, and in the diencephalon. Cells of origin of diencephalic nuclei, which project to the spinal cord, were observed in the nucleus periventricularis hypothalami and in the thalamus ventralis pars medialis which can in this respect be considered hypothalamic. Descending pathways from mesencephalic structures originate from the interstitial nucleus of the fasciculus longitudinalis medialis, the tectum mesencephali, the nucleus intercollicularis, the tectotegmental junction zone, and from diffusely arranged tegmental neurons. A contralateral rubrospinal pathway could be recognized in <jats:italic>Raja<\/jats:italic>, but not in <jats:italic>Scyliorhinus.<\/jats:italic> Rhombencephalic cells of origin of pathways descending to the spinal cord were found in all parts of the reticular formation, i.e., the nucleus raphes inferior, the nucleus reticularis inferior, medius, superior, and isthmi, in two vestibular nuclei, and in three nuclei, which have been tentatively indicated as nucleus B, F, and G. Furthermore cells of origin of descending pathways have been found in the nucleus tractus descendens nervi trigemini, in the nucleus funiculi lateralis, and in the nucleus tractus solitarii. The descending pathways of the two species studied have been compared with those of other vertebrates. It is concluded that the basic pattern in the organization of descending pathways to the spinal cord, as proposed by ten Donkelaar ('76) for terrestrial vertebrates, also holds for cartilaginous fishes.<\/jats:p>","DOI":"10.1002\/cne.902020403","type":"journal-article","created":{"date-parts":[[2005,5,27]],"date-time":"2005-05-27T20:26:39Z","timestamp":1117225599000},"page":"473-491","source":"Crossref","is-referenced-by-count":79,"title":["Cells of origin of pathways descending to the spinal cord in two chondrichthyans, the shark <i>Scyliorhinus canicula<\/i> and the ray <i>Raja clavata<\/i>"],"prefix":"10.1002","volume":"202","author":[{"given":"Wilhelmus J. A. J.","family":"Smeets","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steve J. 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