#chiasma__decussation  an intersection or crossing of two tracts in the form of the letter X
  supertype:  #anatomical_structure__structure__complex_body_part__bodily_structure__body_structure  a particular complex anatomical structure; "he has good bone structure"
  subtype:  #optic_chiasma__opticchiasma__optic_chiasm__opticchiasm__chiasmaopticum  the crossing of the optic nerves from the two eyes at the base of the brain

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