The subsequent branches vary from individual to individual, but follow an overall trend: the more cranial branches are tubular and have a wide, rounded base; the middle bronchi pass dorsally giving off both cranial and caudal forks; the caudal M bronchi arch caudally and then caudoventrally terminating in a sac-like tip.
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Pulmonary anatomy in the Nile crocodile and the evolution of unidirectional airflow in Archosauria.
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