thick long-range axonal tracks

19:36 Apr 23, 2021 

the situation is a bit complicated. The authors of the passage I posted talk about "tracks" but they seem to quote another study by Bullmore and Sporns (written in brackets). Then, reading your answer, I looked for the original article by Bullmore and Sporns, who actually talk about "axonal tracts". So it's probably the case that the authors of the passage quoting these latter authors have misspelled "tracts"... I' m sorry: it's a bit difficult to explain..

13:59 Apr 23, 2021 

If it says "tracts" three times, why do you assume they mean "tracks"?

15:42 Apr 22, 2021 

I have been lucky enough to find the article quoted in the passage - by Bullmore and Sporns - and the authors actually talk about "axonal tracts".. So I guess it should mean "long and thick axonal tracks"...

*****
Multiple
sclerosis is a disorder that causes sporadic autoimmune
attacks and demyelination of axonal tracts in the brain.
The probability that a specific tract will be affected by
a focal lesion is proportional to its volume, rendering
longer tracts more vulnerable. Accordingly, greater
degrees of lesion load are associated with greater loss of
topological efficiency owing to greater damage to longdistance axonal projections128
****