placoden.

Brit.

/ˈplakəʊd/, U.S.

/ˈplæˌkoʊd/

Forms: 1900s plakode, 1900s– placode.

Origin: A borrowing from German. Etymon: German Plakode.

Etymology: < German Plakode (C. von Kupffer 1894, in Sitzungsber. der Königl. Bayerischen Akad. der Wissensch. zu München : Math.-Phys. Classe 24 57) < ancient Greek πλακώδης laminated, flaky < πλακ- , πλάξ flat plate (see placo- comb. form) + -ώδης -ode comb. form¹.In form plakode probably after the German form.

Embryology.

A localized thickening of the ectoderm in a vertebrate embryo which contributes to the formation of a sensory organ, ganglion, feather or scale, etc.

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

1907 in Science (1908) 24 Jan. 143/2 ‘The epibranchial placodes of Ameiurus’, by F. L. Landacre.

1908 Philos. Trans. (Royal Soc.) B. 199 145 Brauer claims that..the ophthalmic portion of the Trigeminus-ganglion complex..originates solely from a thickened epidermal placode, and receives no contribution from the neural crest.

1927 W. Shumway Vertebr. Embryol. vii. 186 Of the three sensory placodes, olfactory, optic, and otic, the optic placode is incorporated and invaginates with the neural plate so that the eye appears to originate from the brain.

1960 Jrnl. Compar. Neurol. 114 11/1 It now seems well established that the placodes provide a distinct cellular contribution to the developing ganglia of the V, VII, IX and X nerves in mammals, just as has long been accepted in fish and amphibians.

1992 Saudi Med. Jrnl. 12 515/2 The formation of the nasal cavity starts with the nasal placodes which appear as convex thickenings of surface ectoderm and later invaginate to form the olfactory pits.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	placode
释义	placoden. Brit. /ˈplakəʊd/, U.S. /ˈplæˌkoʊd/ Forms: 1900s plakode, 1900s– placode. Origin: A borrowing from German. Etymon: German Plakode. Etymology: < German Plakode (C. von Kupffer 1894, in Sitzungsber. der Königl. Bayerischen Akad. der Wissensch. zu München : Math.-Phys. Classe 24 57) < ancient Greek πλακώδης laminated, flaky < πλακ- , πλάξ flat plate (see placo- comb. form) + -ώδης -ode comb. form¹.In form plakode probably after the German form. Embryology. A localized thickening of the ectoderm in a vertebrate embryo which contributes to the formation of a sensory organ, ganglion, feather or scale, etc. 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 1907 in Science (1908) 24 Jan. 143/2 ‘The epibranchial placodes of Ameiurus’, by F. L. Landacre. 1908 Philos. Trans. (Royal Soc.) B. 199 145 Brauer claims that..the ophthalmic portion of the Trigeminus-ganglion complex..originates solely from a thickened epidermal placode, and receives no contribution from the neural crest. 1927 W. Shumway Vertebr. Embryol. vii. 186 Of the three sensory placodes, olfactory, optic, and otic, the optic placode is incorporated and invaginates with the neural plate so that the eye appears to originate from the brain. 1960 Jrnl. Compar. Neurol. 114 11/1 It now seems well established that the placodes provide a distinct cellular contribution to the developing ganglia of the V, VII, IX and X nerves in mammals, just as has long been accepted in fish and amphibians. 1992 Saudi Med. Jrnl. 12 515/2 The formation of the nasal cavity starts with the nasal placodes which appear as convex thickenings of surface ectoderm and later invaginate to form the olfactory pits. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1907
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