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Labeling was found in all laminae except in the outer part of lamina II. Labeled fibers and terminal\u2010like structures were found 8\u201313 segments rostral and 1\u20135 segments caudal to the injected DRGs.<\/jats:p><jats:p>A somatotopic organization was revealed in laminae III, where the labeling seemed to be organized in mediolateral zones. Some of these protruded as fingerlike processes through segments rostral and caudal to the root entry level. An interdigitating pattern for these fingerlike processes was seen between some DRGs, while an extensive overlap was found between other DRGs. Many zones were found to correspond to the known central projections of peripheral sensory nerves supplied by the injected ganglion. This suggests that the central projection of a DRG is highly related to the projections of the peripheral nerves included in the DRG.<\/jats:p><jats:p>The projections to lamina IV were organized in a similar manner as in lamina III, even though the projections showed a higher degree of overlap than in lamina III. No clear somatotopic organization was found in laminae V\u2010IX.<\/jats:p><jats:p>Provided that the topographical relationship between central projections of single peripheral nerves and of DRGs correspond to their peripheral projections, the results of this study, together with results of earlier studies suggest that the outlines of dermatomes are highly related to the territories of peripheral nerves included in the dermatomes.<\/jats:p>","DOI":"10.1002\/cne.902990407","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T19:36:04Z","timestamp":1104608164000},"page":"470-481","source":"Crossref","is-referenced-by-count":69,"title":["Distribution of lumbar dorsal root fibers in the lower thoracic and lumbosacral spinal cord of the rat studied with choleragenoid horseradish peroxidase conjugate"],"prefix":"10.1002","volume":"299","author":[{"given":"C.","family":"Rivero\u2010Meli\u00e1n","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G.","family":"Grant","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2004,10,9]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4471-1305-8"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1978.sp012137"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1977.sp012073"},{"key":"e_1_2_1_5_1","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1113\/jphysiol.1978.sp012257","article-title":"Morphology and organization of axon collaterals from afferent fibres of slowly adapting type I units in cat spinal cord","volume":"277","author":"Brown A. 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