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. 2017 Feb 27;31(2):383–393. doi: 10.1111/jvim.14676

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Copyright © 2017 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine.

This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Normal anatomy (1) proximal esophageal sphincter (PES), (2) esophagus, (3) larynx, (4) epiglottis, (5) valleculae, (6) soft palate, (7) nasopharynx. M: mandible.