Figure. 40.

(a) Grafting experiments showed the effect of the homeostatic flow and the high level of versatility of Hydra tissues [496]. (b) Image of H. vulgaris depicting its most prominent parts. Hydras morphology is simple: a gastric column ends in a head (hypostome) surrounded by tentacles and a basal disk at the other side. (c) Hydra cells can be cut into pieces or even be entirely disassembled and re-aggregated to form a new organism. Within this process, first a hollow sphere is formed. This sphere passes through several phases of pulsations before a new small hydra finally emerges. Figure (a) was adapted from [496], figure (c) was inspired by [497].