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  Axon Diameters in the Cortical White Matter: an Electron Microscopic Study

Schüz, A., & Liewald, D. (2014). Axon Diameters in the Cortical White Matter: an Electron Microscopic Study. Poster presented at 9th FENS Forum of Neuroscience, Milano, Italy.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-3286-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-3596-A
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Schüz, Almut1, 2, Author              
Liewald, D1, 2, Author              
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1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Axon diameters in the cortical white matter are of interest for various reasons: a) to get an impression of the range of conduction velocities, b) to estimate number of fibres in various fibre bundles, c) for comparison with fiber studies in vivo by way of diffusion weighted imaging. We investigated therefore the distribution of diameters of (myelinated) axons in the cortical white matter of human brains and of a macaque with the electron microscope. We took samples a) from the region of the superior longitudinal fascicle, b) from the transition of the white matter between temporal and frontal lobe where the uncinate and the inferior occipitofrontal fascicle merge, and c) from the corpus callosum. All bundles showed similar distributions: the bulk of fibres was relatively thin; the (inner) diameters of myelinated fibers had an average size between 0.5 and 0.8 mm in most samples. The total range of diameters of myelinated fibers was between 0.2 and 9 mm. Thus, a wide range of conduction velocities exists in the various bundles of the cortical white matter. The figure shows an electron microscopic section from the depth of the cortical white matter in the monkey.

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 Dates: 2014-07
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: SchuzL2014
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Title: 9th FENS Forum of Neuroscience
Place of Event: Milano, Italy
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Title: 9th FENS Forum of Neuroscience
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 1612 Start / End Page: - Identifier: -