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Anatomic Limits of the Upper Respiratory Tract and Defining Clinical Signs
| Compartment | Anatomic Limits | Defining Clinical Sign(s) |
|---|---|---|
| I | Nose, nasal cavity, and paranasal sinuses | Sneezing and/or nasal discharge |
| II | Nasopharynx, posterior nares (choanae), and soft palate | Stertor (snort) and reverse sneeze |
| III | Larynx | Stridor (wheeze) |
