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Held open by cartilage rings, about 10–12 cm long. It divides at the level of the fourth thoracic vertebra. The right main bronchus leaves at a steeper angle and is the wider one. That is why aspirated material usually ends up in the right lung. Around 23 generations of branching down to the alveoli. Every division enlarges the total cross-section, so the flow slows down. Only the right lung has one. Together with the oblique fissure it separates three lobes — the left lung has two. Here the left lung steps aside for the heart. It is the reason the left lung is the smaller of the two. Runs from the back downwards to the front. Auscultating from behind, you are mostly listening to the lower lobe. Rests on the diaphragm and moves with every breath. Lying flat, the lower parts ventilate poorly — the reason for repositioning.

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Cartilage rings, 10–12 cm. The right one is steeper and wider. 23 generations of branching. Right lung only. Room for the heart. Back to front. On the diaphragm.

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