What does blastema mean?
A blastema is a mass of undifferentiated, rapidly dividing cells that gathers at the site of a wound in certain animals and serves as the raw material for regrowing lost structures. When a salamander loses a limb, for example, cells at the amputation plane dedifferentiate and proliferate to form a blastema, which then reorganizes itself into muscle, bone, skin, and nerves to reconstruct the missing part. The word belongs almost entirely to the vocabulary of developmental biology, regeneration research, and science writing, where it carries connotations of biological renewal and remarkable healing capacity. It derives ultimately from the Greek word for a sprout or bud, reflecting the idea of new growth emerging from living tissue. For anyone interested in why some animals regenerate while mammals largely cannot, the blastema is the central concept — the cellular seed from which replacement tissue grows.
nounA mass of undifferentiated cells that forms at the site of an injury and gives rise to regenerated tissue, notably in animals capable of regrowing lost body parts such as limbs.
- A mass of undifferentiated proliferating cells that accumulates at a wound site and differentiates to regenerate a missing structure, such as an amputated limb or tail.
"The salamander's severed limb was soon covered by a blastema, from which the new limb gradually regenerated."
"Researchers found that removing the nerve supply prevented the wound from forming a functional blastema."
"In axolotls, virtually every cell in the blastema retains a memory of its original identity as it rebuilds the limb."
Both plurals are accepted; 'blastemas' is the more common anglicized form in modern scientific writing, while 'blastemata' follows the Greek-style plural.
"The researchers compared the gene-expression profiles of blastemas taken from limbs at different stages of regeneration."
Cut off a salamander's leg and its body conjures up a blastema — a blob of cells that remembers how to build the whole limb again, a trick humans never mastered.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of blastema
The word blastema comes from the Greek 'blastos', meaning a sprout, shoot, or bud, via New Latin usage by nineteenth-century biologists who applied it to masses of formative cells. It shares this root with other biology terms built on the same combining form, including blastula, blastocyst, and blastopore, all referring to early or formative stages of cellular life. Its adoption reflects a long tradition in scientific nomenclature of borrowing Greek roots to name newly observed structures under the microscope.
Related word forms
How blastema is actually used
Strictly a technical term used in developmental biology and regeneration research; it is rare in general conversation but appears frequently in scientific journalism about regeneration and stem-cell studies. The plural is either 'blastemas' or the Latinate 'blastemata', both accepted.
Easily confused with blastema
A blastema is a mass of cells involved in tissue regeneration after injury, whereas a blastocyst is an early stage of the mammalian embryo.
A blastema is an adult regenerative cell mass, while a blastula is a hollow sphere of cells formed during early embryonic development.