Dictionary of Biological Psychology
As a noun—decussation—this means a crossing of FIBRES, more or less in the shape of an X; as a verb it means similarly to cross—as in ‘the OPTIC CHIASM is where the OPTIC NERVE decussates’.
It has a Latin root: a decussis was a coin worth ten asses (decem asses shortens to decussis) and it was marked with the Roman numeral ten, X.
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