Figure 5

Change in tongue volumes during tongue base retraction (TBR). (a) Diagram illustrating midsagittal slices of anterior oral tongue (AOT), posterior oral tongue (POT) and tongue base (TB) volumes, and hyoid position prior to TBR. Tongue contours were traced from videoradiographic data of a macaque in lateral view at the beginning (A) and end (B) of TBR. Markers are: red, tongue tip; green, middle superficial; blue, middle deep; light gray, posterior superficial; brown, posterior deep; gray, vallecular. (b) Diagram illustrating changes in tongue shape, midline location of extra volume, and hyoid position at end of TBR. In A and B, marker colors correspond to those in Fig. 2, and the brown marker indicates the hyoid landmark used for TB and POT volume measurements. (c) Change in tongue linear dimensions and volumes during TBR.