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At various stages of postnatal development between postnatal days 1 and 30, we cauterized the infraorbital branch of the trigeminal nerve, which innervates the upper lip, furry buccal pad, and vibrissae that are represented within cerebellar folium crus IIa. The organization of the crus IIa map was then examined 2 to 3 months after denervation. We found that tactile receptive fields had reorganized throughout the denervated area but maintained a fractured somatotopy. Comparison of the reorganization in different animals showed that the denervated upper lip region was consistently and predominantly replaced by representation of the upper incisors. Analysis of evoked field potentials revealed an alteration, in denervated animals, of the response of the granule cell layer to brief tactile stimulation. This response in normal animals consists of two components at different latencies. Animals lesioned later in development were less likely to have the short latency component. This result suggests a difference in the developmental sensitivity of different cerebellum\u2010related pathways to nerve lesions.<\/jats:p>","DOI":"10.1002\/cne.903320408","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T08:53:35Z","timestamp":1104569615000},"page":"487-498","source":"Crossref","is-referenced-by-count":14,"title":["Developmental plasticity in cerebellar tactile maps: Fractured maps retain a fractured organization"],"prefix":"10.1002","volume":"332","author":[{"given":"Leila","family":"Gonzalez","sequence":"first","affiliation":[]},{"given":"Caroly","family":"Shumway","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9e","family":"Morissette","sequence":"additional","affiliation":[]},{"given":"James M.","family":"Bower","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2004,10,9]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-68560-6_2"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901880106"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901930203"},{"key":"e_1_2_1_5_1","doi-asserted-by":"crossref","first-page":"745","DOI":"10.1152\/jn.1983.49.3.745","article-title":"Congruence of the spatial organization of tactile projections to the granule cell and Purkinje cell layers of the cerebellar hemispheres of the albino rat: The vertical organization of the cerebellar cortex","volume":"49","author":"Bower J. 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