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The trachea bifurcates at the level of T4 in the cadaver; in the living subject it descends to T6 in full inspiration. The right main bronchus is wider, shorter and more vertical than the left; therefore more likely to aspirate a foreign body or to be inadvertently entered by a catheter or endotracheal tube. The lungs are divided into bronchopulmonary segments, each with its own blood supply and bronchial...
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