Novel insights into axon diameter and myelin content in late childhood and adolescence

Genc, Sila, Raven, Erika P., Drakesmith, Mark ORCID: https://orcid.org/0000-0001-8574-9560, Blakemore, Sarah-Jayne and Jones, Derek Jones ORCID: https://orcid.org/0000-0003-4409-8049 2023. Novel insights into axon diameter and myelin content in late childhood and adolescence. Cerebral Cortex 33 (10) , pp. 6435-6448. 10.1093/cercor/bhac515

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Abstract

White matter microstructural development in late childhood and adolescence is driven predominantly by increasing axon density and myelin thickness. Ex vivo studies suggest that the increase in axon diameter drives developmental increases in axon density observed with pubertal onset. In this cross-sectional study, 50 typically developing participants aged 8–18 years were scanned using an ultra-strong gradient magnetic resonance imaging scanner. Microstructural properties, including apparent axon diameter (da) ⁠, myelin content, and g-ratio, were estimated in regions of the corpus callosum. We observed age-related differences in da ⁠, myelin content, and g-ratio. In early puberty, males had larger da in the splenium and lower myelin content in the genu and body of the corpus callosum, compared with females. Overall, this work provides novel insights into developmental, pubertal, and cognitive correlates of individual differences in apparent axon diameter and myelin content in the developing human brain.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Psychology Cardiff University Brain Research Imaging Centre (CUBRIC)
Publisher:	Oxford University Press
ISSN:	1047-3211
Date of First Compliant Deposit:	12 December 2022
Date of Acceptance:	7 December 2022
Last Modified:	28 Feb 2024 07:45
URI:	https://orca.cardiff.ac.uk/id/eprint/154808

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