Fig. 10. Overall movement of the buccal mass based on the changing angle of the jaw line relative to the fixed tank holding the animal. (A-D) Data from each of the four individual swallow sequences plotted as angle (degrees) as a function of time (ms). (E) Normalized, averaged and smoothed jaw line angle during the swallowing cycle. Data are shown as mean ± 1 S.D. Note that all four swallows show different patterns of change in the angle of the jaws. (F) A black line is used to highlight the jaw angle for frames 1, 9, 18 and 22. Compare original frames in Fig. 5. For definitions of periods t1, t2 and t4, see Materials and methods.