de·cus·sa·tion /ˌdɛkəˈseʃən, ˌdiˌkʌ-/
  交叉
  de·cus·sa·tion /ˌdɪ(ˌ)kəˈseʃən/ 名詞
  De·cus·sa·tion n.  Act of crossing at an acute angle, or state of being thus crossed; an intersection in the form of an X; as, the decussation of lines, nerves, etc.
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  decussation
       n : an intersection or crossing of two tracts in the form of the
           letter X [syn: chiasma, chiasm]