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اکتودرم|برونپوست
Hydras are diploblastic animals, having only ectoderm and endoderm (FIGURE 22.3A).
(B) Schematic of the myoepithelium with its unipotent endo- dermal and ectodermal cells and its multipotent interstitial stem cells.
Endodermal and ectodermal cetls are unipotent progenitor cells that divide continuously, producing more lineage-restricted epithelia.
The third cell type is a multipotent interstitial stem cell found within the ectodermal layer (see Figure 22.3B).
the wound epidermis thickens to form the apical epidermal cap (AEC) (see Figure 22.17B), which acts similarly to the apical ectodermal ridge during normal limb development (see Chapter 19; Han et al. 2001).
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