mesectodermn.
/mɛsˈɛktə(ʊ)dəːm/, /mᵻˈsɛktə(ʊ)dəːm/, /mɛzˈɛktə(ʊ)dəːm/, /mᵻˈzɛktə(ʊ)dəːm/, U.S. /mɛzˈɛktəˌdərm/, /mɛsˈɛktəˌdərm/ Embryology.
Mesenchyme that is derived from ectoderm or the neural crest rather than from mesoderm. Also: the outer layer of blastoderm before its differentiation into ectoderm 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.
1921 Jrnl. Compar. Neurol. 33 4 In 1894 Miss Platt elaborated the idea..introducing the terms mesectoderm and mesentoderm for mesenchyme derived from the ectoderm and endoderm, respectively.
1956 C. H. Waddington Princ. Embryol. xii. 256 ‘Mesectoderm’..is also used for the epiblast of a blastoderm before the mesoderm has invaginated and thus become separated from the ectoderm.
1965 L. B. Arey Developmental Anat. (ed. 7) ii. 22 Mesenchyme is predominantly derived from the mesoderm,..but some of it comes from the ectoderm and this contribution is often called mesectoderm.
1995 Development 121 317 The only observed exceptions in the CNS are the midline glia derived from the mesectoderm and two of three segmental nerve root glial cells.
This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).
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n.1894