A thin layer of smooth muscle in the scrotum that contracts reflexively in response to cold or touch.
From Greek 'dartos' meaning 'flayed' or 'skinned,' named by anatomists for its thin, denuded appearance under the skin.
The dartos is part of the body's thermoregulation system—it literally moves your testicles closer to your body when cold, a reflex so automatic you don't even think about it!
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