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Fig. 11. Mid-sagittal strain imaging during sagittal bending. (A) Employing the
approach shown in Fig. 7, the
x, y and z normal strain components of the strain tensor are
shown. Observe that x-direction and z-direction strain
increased and decreased radially from the center of curvature, respectively.
(B) Model of hydrostatic lingual tissue bending. The hydrostatic model
indicates that tongue bending results from two synergistic mechanisms,
unilateral longitudinal sheath contraction and graded intrinsic core fiber
contraction which increases with distance from the inside edge. Unilateral
sheath contraction results in surface shortening only, without bending,
whereas simultaneous sheath and graded core contraction, which maintains
x-sectional area by increasing resistance to shear, results in
bending. (Reproduced with permission from
Napadow et al., 1999a.)
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