The proper name for your tailbone, coccyx was derived from the Greek word for cuckoo—“kokkux”—because the curved shape of the bone resembles the bird’s beak. Scientists consider your tailbone a vestigial structure, which humans no longer needed once we began walking upright; tails help other mammals balance. Don’t miss these 15 names for things you never knew had names.
The name for these important blood vessels hails from the Latin and Greek word “arteria,” which means “air holder.” Ancient anatomists thought arteries were actually air ducts, since they didn’t hold any blood after death. Along with veins and capillaries, your body is home to an incredible 100,000 miles’ worth of blood vessels.