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. 2019 Nov 12;48:62. doi: 10.1186/s40463-019-0383-2

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Exposures offered by the a) McIvor gag, b) Feyh-Kastenbauer gag, and c) Floor of Mouth Window. Note that the circumvallate papillae is easily visible transorally without the aid of endoscopes. d) Endoscopic view with the Floor of Mouth Window