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n. pl. blas·te·mas or blas·te·ma·ta (-mə-tə)
1. A mass of undifferentiated cells from which an organ or a body part develops, either in normal development or in the regeneration of a lost body part.
2. A structureless substance from which it was formerly believed that cells are formed.

[Greek blastēma, offspring, sprout, from blastos, bud.]

blas·te′mal, blas′te·mat′ic (blăs′tə-măt′ĭk), blas·te′mic (blă-stē′mĭk) adj.


(blæˈstiːməl) or


(Biology) of or relating to blastema
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Adj.1.blastemal - of or relating to blastemata
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References in periodicals archive ?
All tumors were identified and categorized into blastemal, epithelial, stromal, mixed type, and anaplasia by pathologist after excision, according to National Wilms' Tumor Study (NWTS).
Pathologically, Classical Wilms' tumour has triphasic histology, with components of blastemal, epithelial, and stromal structures, as found in our case.
PPB has two histological components; the blastemal cells and the mesenchymal cells.
2005) studied transgenic zebrafish that expressed a dominant-negative Fgf receptor, and demonstrated that Fgf signaling instructs position-dependent growth rate by modulating shh expression in the wound epidermis and position-dependent blastemal function (Lee et al.
Fin regeneration is characterised by: formation of a multilayered wound epidermis, disorganisation and distal migration of mesenchymal cells proximal to the amputation plane, proliferation of these mesenchymal cells to form the regeneration blastema, continued distal blastemal proliferation to facilitate outgrowth and proximal blastemal differentiation to replace missing structures (Goss and Stagg, 1957; Santamaria and Becerra, 1991; Johnson and Weston, 1995; Poss et al.
The list includes blastemal predominant Wilms tumor, lymphoblastic lymphoma, synovial sarcoma, solid variant of alveolar rhabdomyosarcoma, clear cell sarcoma of the kidney, neuroblastoma, desmoplastic small round blue cell tumor, and small cell carcinoma.
However, CCAM shows only cysts lined by respiratory epithelium, with muscle and fibrous tissue, within cyst wall and absence of malignant cells, cambium layer and any blastemal or sarcomatous component, as seen in pleuropulmonary blastoma.
The blastemal cells and native kidney can be seen on the right.