An external or accessory bronchus, a small air tube extending from the main bronchial system in the lungs.
From Greek 'ekto-' (outside) and 'bronchion' (bronchus, referring to windpipe branches), describing a bronchus located outside or auxiliary to the main system.
Some lungs have bonus air tubes that branch off the main system—nature occasionally builds extras, and naming them 'ectobronchium' lets doctors know these aren't the standard pathways, like finding a secret hallway in your body.
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