AN24.1-6 | Lungs & Trachea — Summary & Reflection

REFLECT

KEY TAKEAWAYS

Lungs & Trachea — Key Points:

1. Trachea: C6 → carina (T4/T5); C-rings open posteriorly (trachealis muscle); right bronchus wider/shorter/more vertical
2. Right lung: 3 lobes (upper, middle, lower), 10 bronchopulmonary segments; oblique + horizontal fissures
3. Left lung: 2 lobes, 8–10 segments; oblique fissure only; lingula = middle lobe equivalent
4. Hilum: bronchus, pulmonary artery, 2 pulmonary veins, bronchial vessels, lymphatics, nerves
5. Dual blood supply: pulmonary (gas exchange, right heart → left atrium) + bronchial (nutritive, aorta)
6. Pleura: visceral (no pain) + parietal (pain); costodiaphragmatic recess = most dependent, fills first
7. Lung base (erect): 6th rib MCL, 8th MAL, 10th paravertebral; pleura extends 2 ribs lower