  A continuum model of epithelial tissue mechanics was formulated using
cellular-level mechanical ingredients and cell morphogenetic processes,
including cellular shape changes and cellular rearrangements. This model can
include finite deformation, and incorporates stress and deformation tensors,
which can be compared with experimental data. Using this model, we elucidated
dynamical behavior underlying passive relaxation, active
contraction-elongation, and tissue shear flow. This study provides an
integrated scheme for the understanding of the mechanisms that are involved in
orchestrating the morphogenetic processes in individual cells, in order to
achieve epithelial tissue morphogenesis.
