develops from ends during starts during blastomere V2.2 blastomere V2.2.1 D3 eriksegerdell V2.2.1 2016-08-16T20:28:11Z XAO:0005110 Blastomere which lies lateral to blastomere V2.1.1, in the fourth tier of blastomeres. It contributes cells to the epidermis and neural crest, spinal cord, somites, foregut, hindgut, and fewer cells to the head, pharyngeal mesoderm and proctodeum. xenopus_anatomy ventral vegetal hemisphere blastomere NF stage 6 (32-cell)