Figure 13.

Effect of the anisotropy on the orientation of principal strain: (a) evolution with time of strain for the isotropic (solid line), intermediately anisotropic (dashed line) and perfectly transversely anisotropic case (dotted line); (b) three-dimensional view of the brainstem; (c) orientation of the principal strain for the isotropic case (k = 0.33); (d) orientation of the principal strain for the intermediately anisotropic case (k = 0.20); (e) orientation of the principal strain for the perfectly transversely anisotropic case (k = 0.00). (Online version in colour.)