an intersection or crossing of two tracts in the form of the letter X
例句
There is no decussation in the lateral corticospinal tract after the decussation at the medullary pyramids. 它们在髓状锥体交叉后，不会在皮层脊髓侧束中交叉。
Of which, the length of Tianchen Lane is 350 meters and the Daochang Lane is 300 meters, the above two lanes are in decussation. 其中天成巷段长350米，道场巷段长300米，两街呈十字交叉。
decussation of superior cerebellar peduncles 结合臂交叉
Decussation lemnisci of medulla oblongata 延髓丘系交叉
decussation of brachium conjunctivum 结合臂交叉
Decussation of inferior cerebellar peduncles 小脑下脚交叉
