Two muscular tubes that transport urine from the kidneys to the bladder through rhythmic contractions called peristalsis.
From Greek oureter, derived from ouron meaning 'urine,' literally translating to 'urine carrier' - a straightforward anatomical naming that reflects their primary function.
Your ureters are like biological conveyor belts that never stop moving - they use wave-like muscle contractions to push urine downward even if you're upside down! Kidney stones cause excruciating pain precisely because they get stuck in these narrow tubes, causing the muscular walls to spasm as they try to push the stone through.
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