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Previous Article | Next Article
Volume 16, Number 10, Issue of May 15, 1996 pp. 3219-3235
Copyright ©1996 Society for NeuroscienceThe Ganglionic Eminence May Be an Intermediate Target for Corticofugal and Thalamocortical Axons
Received Nov. 21, 1995; revised Feb. 15, 1996; accepted Feb. 22, 1996.
Christine Métin and Pierre Godement Institut Alfred Fessard, Centre National de la Recherche Scientifique UPR 2212, 91198 Gif-sur-Yvette, France
In the nervous system of many species, growing axons associate transiently with cellular groupings along their path. Whether this mechanism applies to the development of corticothalamic and thalamocortical projections is unknown. Using carbocyanine dyes, we studied the early growth of both corticofugal and thalamocortical fibers in hamster embryos. At embryonic day 11.5 (E11.5), corticofugal fibers invade the lateral ganglionic eminence (LGE), and thalamocortical fibers invade the medial ganglionic eminence (MGE). At this age, both sets of fibers are not yet in contact with each other. At the same time, neurons in each subdivision of the GE grow toward the cortex and thalamus. During the next 24 hr, corticofugal and thalamocortical fibers remain within the confines of the GE, where they course at different radial levels and bear large and complex growth cones. In the LGE, corticofugal fibers are often found in close association with cells that are likely to be neuronal. Starting on E13.5, both early projections from the GE decrease, and corticothalamic and thalamocortical fibers invade their definitive target regions. To test whether the GE specifically orients the growth and trajectories of cortical fibers even in the absence of the reciprocal thalamic projection, we cocultured explants of cortex and GE from either hamster or mouse embryos. These experiments showed that the GE, but not other tested brain regions, is able specifically to orient the growth of cortical axons. We therefore suggest that the GE may be an intermediate target in the pathfinding of axons between the cortex and the thalamus.
Key words: development; cortex; dorsal thalamus; basal telencephalon; early projections; guidance; axon outgrowth
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