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Fig. 8. Mean hyoid depression (0%–100%) and elevation (100%–200%)
profiles with the calculated four-bar model output for hyoid-depression
mechanism 2A (A–C, top), together with length of the sternohyoideus
muscle (m-sh; A–C, bottom). Separate graphs are shown for each
individual (N=20). The shaded areas accompanying each curve indicate
S.E.M. Note that these
S.E.M. values are larger in case the
radio-opaque marker is absent at the tip of the cleithrum (B,C). The lower and
upper broken, grey lines represent the output of the four-bar model with,
respectively, a fully elongated sternohyoideus muscle and the sternohyoideus
at minimum length. The latter curve is partly not displayed in B when there
were no analytical four-bar solutions in more than half of the cases. Grey
bars indicate the period during which the sternohyoideus shortens. Colour
codes are indicated in the key above the figure. Mech. 2A, see
Fig. 2.
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