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© Research
Publication : Frontiers in neuroanatomy

Could Sex Differences in White Matter be Explained by g ratio?

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Frontiers in neuroanatomy - 01 Jan 2009

Paus T, Toro R,

Link to Pubmed [PMID] – 19753325

Link to DOI – 10.3389/neuro.05.014.2009

Front Neuroanat 2009 ; 3(): 14

Recent studies with magnetic resonance imaging suggest that age-related changes in white matter during male adolescence may indicate an increase in g ratio wherein the radial growth of an axon outpaces a corresponding increase in myelin thickness. We review the original Rushton (1951) model where a g ratio of approximately 0.6 represents an optimal relationship between the axon and fibre diameters vis-à-vis conduction velocity, and point out evidence indicating slightly higher g ratio in large-diameter fibres. We estimate that fibres with a diameter larger than 9.6 mum will have a relatively thinner myelin sheath, and brains with increasingly larger proportions of such large-diameter fibres will have progressively lower concentration of myelin. We conclude by pointing out possible implications of “suboptimal” g ratio for the emergence of “disconnection” disorders, such as schizophrenia, in late adolescence.