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decussation

decussation Decussation is the crossing of nerve fibre pathways in the central nervous system at the midline, so that a pathway ends in centers of different levels on the opposite side.

Decussation is the crossing of nerve fibre pathways in the central nervous system at the midline, so that a pathway ends in centers of different levels on the opposite side. In this historical usage, it is contrasted with a commissure, which is taken to link corresponding centers.

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Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Decussation” (Decussation).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “decussation.” Development preview.

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