Which preposition to use with neurones

to Occurrences 5%

It is important to note that neurones never act singly; they always act in groups, the nervous current passing from neurone to neurone.

in Occurrences 1%

Thence it pushes on, over association neurones in the brain to motor neurones, over which it passes down the spinal cord again to muscles, and ends in some movement.

Which preposition to use with  neurones