this post was submitted on 26 Mar 2026
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Science Memes

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[–] Diddlydee@feddit.uk 56 points 14 hours ago* (last edited 2 hours ago) (1 children)

Nearly all tetrapods have a laryngeal nerve that goes from the brain stem to the larynx, but doesn't go straight for the few inches, instead travelling down the neck to go around the aortic arch above the heart. It's a throwback to when we were ocean dwelling and had gills much closer to the heart.

In giraffes this nerve takes a 15 ft detour.

In something like a brachiosaurus which had a neck around 30 ft long, this would be a 60ft detour.

A great proof of evolution, of making do with what is there and adapting.

[–] ohulancutash@feddit.uk 20 points 14 hours ago (2 children)

Brachiosaurus wasn’t a mammal.

[–] Semi_Hemi_Demigod@lemmy.world 50 points 13 hours ago (1 children)

Yes but a brachiosaurus is still a fish

[–] Klear@quokk.au 13 points 12 hours ago

Hell yeah, fuck paraphyletic groups.

[–] Diddlydee@feddit.uk 12 points 13 hours ago* (last edited 13 hours ago) (1 children)

Correct. I'll change to Tetrapods.

[–] Photonic@lemmy.world 11 points 11 hours ago (1 children)

I wasn’t gonna say this but since you’re making changes anyway: the recurrent laryngeal nerve doesn’t go around the heart but around the aortic arch and the great arteries.

[–] Monument 6 points 8 hours ago

Meh, I’ve seen better arteries.