what is the advantage of DECUSSATION
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Your question is actually hotly debated among evolutionary biologists and neuroscientists. There are, in fact, multiple theories about why tracts cross in the human nervous system. My favorite theory, though, has to do with the evolution of the entire vertebrate lineage. It is called the “somatic twist” hypothesis[i], and it asserts that neural crossings (technically called “decussations”) are the byproduct of a much larger evolutionary change—the switch from having a ventral (belly-side) nerve cord to dorsal (back-side) nerve cord.
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It is called the “somatic twist” hypothesis[i], and it asserts that neural crossings (technically called “decussations”) are the byproduct .
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