Figure 4.

Macroporous structure. Representation of the types of pore space depending on their connection to the surface of the material (open, closed, and blind‐ended; Ashworth et al., 2014) for (a) an ideal structure composed of channels, (b) a tortuous porous network and a scaffold composed of (c) spherical interconnected pores or (d) rods. (e) and (g) show corresponding images of scaffolds composed of interconnected macropores (obtained by PMMA skeleton and organic foam impregnation, respectively), (f) and (h) show scaffolds composed of intertwined fibers obtained by robocasting (from Martinez‐Vazquez, Pajares, Guiberteau, and Miranda, 2014) and fiber spunbonding (from VanGordon et al., 2011). respectively. Scale bar = 200 µm