Anatomy
That part of airways supported by cartilage, not involved in gas exchange; trachea branches at carina (level sternal angle, T5) – primary bronchi (r, l) – secondary (lobar; 3r, 2l) – tertiary (segmental; 10r, 8- 10l); incrementally down from trachea, as bronchi branch and get smaller, there is more smooth muscle, less hyaline cartilage (rings proximally, isolated islands/plates distally), lining changes (ciliated mucous to squamous).
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