Blastema

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blastema

[bla′stēma]
(embryology)
A mass of undifferentiated protoplasm capable of growth and differentiation.

Blastema

 

in the study of regeneration, the accumulation of homogeneous, nonspecialized cells on the surface of a wound after amputation of an organ. Tissues of the organ that is being restored are formed from blastemas in the course of regeneration.

In embryology: (1) a group of cells from which a new individual develops by asexual reproduction in some multicellular animals (Coelenterata, worms, Ascidia, and others); (2) the surface layer of cytoplasm in the cen-trolecithal ova of many arthropods. By means of fine outgrowths the blastema is connected to the cytoplasm, which surrounds the nucleus situated in the center of the ovum.

References in periodicals archive ?
While a limb blastema can produce its own FGF-2, the scientists believe it needs an initial supply from nerves before it becomes self-sufficient.
The most significant seems to be that the worms do not dedifferentiate cells to create the blastema.
Wherever planaria are cut, the neoblasts migrate to the site and form a blastema by themselves.