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PubMed1997

Corticopontine terminal fibres form small scale clusters and large scale lamellae in the cat.

We investigated whether terminal fibres in the pontine nuclei are arranged in a lamellar pattern like that demonstrated earlier for pontocerebellar neurones. Following tracer injections in visual and parietal cortices and subsequent computer-based 3-D analysis, we found that labelled corticopontine terminal fibres form numerous sharply delimited aggregates of variable shape. Several of the aggregates are cylindroids (diameter 200-300 microns, length 1-3 mm). The aggregates are confined to a lamellar subspace, the position of which depends on the anteroposterior location of the cortical injections. These findings suggest that the cerebroponto-cerebellar system may be organized according to fairly simple, topographical rules. We discuss the implications of our results in relation to the development of corticopontine topographical organization.

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