39 - Neurons, Double-crossed
The Curious Clinicians
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The Benefits of Having Visual Tracks Cross the Optic Chiasm
Cajal theorized that crossing the midline evolved eons ago in limbed vertebrates to ensure that the right half of the brain and vice versa responds to the left side of the world. And there are some evolutionary biological observations that have been made that support Cajal's theory. So who knows? But I mean, it's sort of beautiful beautifully unprovable.
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