mesendodermn.
/mɛˈsɛndə(ʊ)dəːm/, /mᵻˈsɛndə(ʊ)dəːm/, U.S. /mɛzˈɛndəˌdərm/, /mᵻzˈɛndəˌdərm/; see also meso- comb. form. Embryology.
Mesenchyme that is derived from endoderm rather than from mesoderm. Also: the inner layer of blastoderm before its differentiation into endoderm and mesoderm.
ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > membrane and layers of cells
germinal layer1836
cell layer1843
mucous layer1846
germ layer1855
mesoblast1857
blastoderm1859
head fold1873
mesoderm1873
epiblast1875
hypoblast1875
splanchnopleure1875
mesenchyme1881
acroblast1884
mesothelium1886
epimere1890
mesectoderm1894
mesendoderm1894
cœloblast1895
placode1907
shield1913
mesentoderm1921
meristoderm1945
bilayer1962
1894 Jrnl. Royal Microsc. Soc. 544 Miss J. B. Platt has studied the ontogenetic differentiation of the ectoderm in Necturus. The ‘mesoderm’ in the head is differentiated by the yolk spherules which it contains into two sharply separable layers—mesectoderm and mesendoderm.
1934 Philos. Trans. (Royal Soc.) B. 223 178 Yolk cells are continually being formed during the gastrulation period from the inner cells of the mesendoderm.
1964 H. W. Manner Elem. Compar. Vertebr. Embryol. v. 50 The morphological result of this invagination [of the blastula] is a cup-like structure, composed of two layers of cells, an outer ectoderm and an inner mesendoderm, so called because it contains the presumptive material for both the mesoderm and endoderm.
1995 Development 121 1402/1 At stage 4, strong expression was observed..in developing mesendoderm in the primitive groove.
This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).
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