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Message: <blockquote data-quote="Fishalt" data-source="post: 94666" data-attributes="member: 228">So we're just going to ignore my last post? That's what we're doing. OK.The issue isn't the functionality of the nerve. It does what it does. The issue is that there's absolutely no reason for it to be designed in such a way. In the cited example of the Giraffe, it is akin to a person who lives opposite a corner store walking around the block to buy a bottle of milk rather than just directly crossing the street.Like many other questions about our anatomy, it can be explained by embryology. During development, the head and the heart originate closely together, and so the RLNs develop close to the aorta. The formation of the neck pushes the head and heart apart, dragging the vessels down into the thorax, along with the RLNs. The RLNs will elongate to maintain its connection to the larynx while being hooked around the vessels of the heart, and so the U-turn is formed.As much as necks vary, the RLN follows suit. From fish, to humans, to giraffes, the nerve makes a bigger and bigger U-turn in order to reach the larynx. When it comes to humans, the 10cm detour is already strange. But because of their long necks, giraffes are the go-to example since their RLNs will approach 5 meters in length in larger animals.</blockquote>

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