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(1) Cerebellar size is mildly reduced in heterozygous weaver (+\/<jats:italic>wv<\/jats:italic>) mice and markedly reduced in homozygotes (<jats:italic>wv<\/jats:italic>\/<jats:italic>wv<\/jats:italic>), but the pattern of fissures is essentially normal. Comparison with other mutants displaying small cerebella suggests that cell proliferation rate in the external granular layer is a key deteminant of cerebellar cortical folding. (2) Mossy fiber terminals differentiate on schedule despite the reduced number and abnormal positions of granule cells. However, many of them enter the modified molecular layer, and as noted especially in noninbred <jats:italic>wv<\/jats:italic>\/<jats:italic>wv<\/jats:italic> mice one to two years old, form synapses with dendrites of aberrant granule cells. Where granule cells are absent, mossy fibers form more than the normal number of synapses with dendrites of Golgi type II neurons. (3) Purkinje cells are only mildly affected by the disorder of neighbouring cells. Their dendrites grow abnormally into the territory occupied by external granule cells, reach the external surface, and may turn inward. They form few tertiary branches. Dendritic spines are present in profusion and show membrane thickenings akin to normal postsynaptic elements. Although they receive no axonal contacts, the spines persist, enveloped by glial processes, for at least two years. Apart from the absence of parallel fiber contacts, afferent and intrinsic axons form the normal classes of synaptic connections with Purkinje cells. (4) Interneurons of the molecular layer are generated on schedule. At the time of their earliest recognition, they reside in the external granular layer, where they receive synaptic contacts from climbing fibers and other interneurons. In the absence of parallel fibers, interneurons differentiate <jats:italic>in situ<\/jats:italic> but their dendrites are abortive and randomly oriented. Growth of their dendrites, in contrast to that of Purkinje cell dendrites, appears to be markedly influenced by the organization of the local cellular milieu.<\/jats:p>","DOI":"10.1002\/cne.901520203","type":"journal-article","created":{"date-parts":[[2005,5,27]],"date-time":"2005-05-27T20:08:41Z","timestamp":1117224521000},"page":"133-161","source":"Crossref","is-referenced-by-count":389,"title":["Organization of cerebellar cortex secondary to deficit of granule cells in weaver mutant mice"],"prefix":"10.1002","volume":"152","author":[{"given":"Pasko","family":"Rakic","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard L.","family":"Sidman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2004,10,9]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901450305"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901460305"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901260302"},{"key":"e_1_2_1_5_1","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1007\/BF00520943","article-title":"Arrested granule cells and their synapses with mossy fibers in the molecular layer of the cerebellar cortex","volume":"139","author":"Chan\u2010Palay V.","year":"1972","journal-title":"Z. 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