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Region Hovedstaden - en del af Københavns Universitetshospital
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Axon morphology is modulated by the local environment and impacts the noninvasive investigation of its structure-function relationship

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Vis graf over relationer

Axonal conduction velocity, which ensures efficient function of the brain network, is related to axon diameter. Noninvasive, in vivo axon diameter estimates can be made with diffusion magnetic resonance imaging, but the technique requires three-dimensional (3D) validation. Here, high-resolution, 3D synchrotron X-ray nano-holotomography images of white matter samples from the corpus callosum of a monkey brain reveal that blood vessels, cells, and vacuoles affect axonal diameter and trajectory. Within single axons, we find that the variation in diameter and conduction velocity correlates with the mean diameter, contesting the value of precise diameter determination in larger axons. These complex 3D axon morphologies drive previously reported 2D trends in axon diameter and g-ratio. Furthermore, we find that these morphologies bias the estimates of axon diameter with diffusion magnetic resonance imaging and, ultimately, impact the investigation and formulation of the axon structure-function relationship.

OriginalsprogEngelsk
TidsskriftProceedings of the National Academy of Sciences of the United States of America
Vol/bind117
Udgave nummer52
Sider (fra-til)33649-33659
Antal sider11
ISSN0027-8424
DOI
StatusUdgivet - 29 dec. 2020

Bibliografisk note

Copyright © 2020 the Author(s). Published by PNAS.

ID: 61651253