Extrathoracic airways

Part of the respiratory tract consisting of (1) the anterior nasal passage, and (2) the posterior nasal passage, pharynx and larynx, designated as the ET₁ region and ET₂ region, respectively, of the Human respiratory tract model as defined in ICRP Publication 130.

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from ICRP Publication 130, 2015

Part of the respiratory tract consisting of the anterior nasal passage (the ET₁ region) and the posterior nasal passage pharynx and larynx (the ET₂ region) as regions of the Human respiratory tract model.