Complex materials show interesting mechanical properties, an example of these materials is given by the eggshell, which resistance is highly asymmetric allowing to support big external forces and weak forces from the interior, to facilitate the birth of the bird. Within the complex materials also we can find the cells like the axons. How the complex materials respond to external forces?, how the fractures in them propagate?, how the cells move? and how they interact with the substrate? are some of the questions which we are looking for answers. We have centered our attention on the mechanics and dynamics of the axons, the characterization of the mechanical properties of the natural bioceramics, like eggshells and "picoroco" shells and the characterization of wrinkles in thin polymer membranes...