FIGURE 4.

Volumes of sub-volumes for all voice qualities, vowels, and pitch values in cm³. Consistently to Figure 2, the oropharynx front (OPf) and the oropharynx rear (OPR) are symbolized by blue and gray color, and the upper hypopharynx (HPu) and the lower hypopharynx (HPl) are highlighted green and red, respectively. The epilarynx tube (ET), Sinus piriformis (SP), and ventricular volume (VV) are highlighted in orange, yellow, and purple, respectively. For clarity reasons, the anatomical order is not considered.