part of ends during starts during death regenerating tissue blastema wound epidermis apical wound epidermis A layer of epidermal cells that initially covers the surface of an amputation site. Fibroblasts from the surrounding connective tissue migrate across the amputation surface to meet at the center of the wound. These fibroblasts multiply to form a blastema, which are the progenitors for the new limb. XAO:0004397 2012-05-05T05:15:00Z xenopus_anatomy eriksegerdell NF stage 13