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. 2022 Dec 23;13:1081622. doi: 10.3389/fphys.2022.1081622

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Copyright © 2022 Fleischer, Rummel, Stritt, Fischer, Bock, Echternach, Richter and Traser.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Definition of seven sub-volumes needed for the volumetric analysis of the sub-volumes (exemplarily shown for Belting /aː/ (A♭3). The upper row shows the mid-sagittal, coronal, and the transversal plane of the MRI data and the segmented cavities. The lower row shows the exploded view of the sub-volumes in the sagittal and coronal view. The blue color is used to highlight the oropharynx front (OPf), and the oropharynx rear (OPR) is shown in gray. The upper hypopharynx (HPu) is highlighted in green, whereas the lower hypopharynx (HPl) is highlighted in red. Finally, the epilarynx tube (ET), Sinus piriformis (SP), and ventricular volume (VV) are shown in orange, yellow, and purple, respectively.