right brain, left side body; left brain, right side body… why?
Our brains have crossed wires. Each cerebral hemisphere controls the opposite side of the body. When I move my left hand, it’s my right brain that’s doing it. Today, Phil and I look at a theory about how and why that’s true for us, and every other animal with a spine.
Along the way we talk about vertebrate brain structure. Here’s a link about some of the older structures in our brain, that we share with most vertebrates, like birds and dogs and frogs and turtles and…
We also talk a bit about the yolk sack that humans have before we’re born. Here’s a link.