decussation

noun

de·​cus·​sa·​tion ˌde-kə-ˈsā-shən  ˌdē-ˌkə- 

1

: the action of crossing (as of nerve fibers) especially in the form of an X

2

: a crossed tract of nerve fibers passing between centers on opposite sides of the nervous system

Word History

First Known Use

circa 1656, in the meaning defined at sense 1

Medical Definition

decussation

noun

de·​cus·​sa·​tion ˌdē-(ˌ)kə-ˈsā-shən 

1

: the action of intersecting or crossing (as of nerve fibers) especially in the form of an X see pyramidal decussation

2

a

: a band of nerve fibers that connects unlike centers on opposite sides of the nervous system

b

: a crossed tract of nerve fibers passing between centers on opposite sides of the central nervous system : commissure