An aerodynamic valve in the avian primary bronchus

Ning Wang, Robert B. Banzett, Christopher S. Nations, Farish A. Jenkins

Research output: Contribution to journalArticlepeer-review


The segmentum accelerans in geese is a constriction in the caudal end of the primary bronchus. Experimental evidence suggests that this part of the airway functions as an inspiratory aerodynamic valve, accelerating the incoming airstream past the ventrobronchial openings. The luminal diameter of the segmentum accelerans dilates in the presence of elevated CO2 levels, probably through relaxation of smooth muscle. Physiological control of the segmentum accelerans may permit inspiratory aerodynamic valving to be maintained throughout a wide range of ventilatory flows.

Original languageEnglish (US)
Pages (from-to)441-445
Number of pages5
JournalJournal of Experimental Zoology
Issue number4
StatePublished - Jul 1 1992
Externally publishedYes

ASJC Scopus subject areas

  • Animal Science and Zoology


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