blasto-, blast-, -blast, -blastic

(Greek: germ, bud; shoot, formative cell or layer; of or pertaining to an embryonic or germinal stage of development)

Fissure of a portion of the spinal cord.
1. The mesoderm, especially in the early states of embryos.
2. The middle of the three cell layers in an embryo, from which connective tissue, muscle, blood, dermis, bone, and other tissues develop.