Then there's the nerve (vagus) attachment from our brain's speech center to our larynx. It takes a long detour, rather than being directly connected in a straight line. This is because when that nerve first appeared, our ancestors were fish, had no necks, and their hearts were right up close to their heads (back then, it was a straight line connection). As a result, as our ancestors developed necks, and our hearts moved further away from our heads, the nerve link between the brain and the voice box was on the wrong side of the right subclavian artery. This nerve serves no other function but to connect the speech center of our brains to our larynx, so the detour pathway it takes cannot be explained in any other way.
