Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop.
from The Century Dictionary.
- noun The middle germinal layer of the three-layered embryo of any metazoic animal, lying between the endoderm and the ectoderm.
- noun In botany, the middle layer of tissue in the shell of the spore-case of an urn-moss.
from the GNU version of the Collaborative International Dictionary of English.
- noun The layer of the blastoderm, between the ectoderm and endoderm; mesoblast. See
Illust. ofblastoderm andectoderm . - noun The middle body layer in some invertebrates.
- noun The middle layer of tissue in some vegetable structures.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun embryology One of the three
tissue layers in theembryo of ametazoan animal . Throughembryonic development , it will produce many internalorgans of theadult , e.g. muscles, spine andcirculatory system .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
Etymologies
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Examples
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The outer layer of this ‘gastrula’ is called the ectoderm, the inner layer is the endoderm, and there are also some cells thrown into the space between the ectoderm and endoderm, which are called mesoderm.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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The outer layer of this ‘gastrula’ is called the ectoderm, the inner layer is the endoderm, and there are also some cells thrown into the space between the ectoderm and endoderm, which are called mesoderm.
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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In contrast to flies, which have a clearly segmented ectoderm, the mesoderm is the primary vertebrate tissue that is organized in a metameric pattern.
Nobel Lecture The Identification Of Genes Controlling Development In Flies And Fishes 1995
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According to Haeckel, the origin of the generative products in the mesoderm is a heterotopic phenomenon, for he considers that they must have originated phylogenetically in one of the two primary layers, ectoderm or endoderm.
Form and Function A Contribution to the History of Animal Morphology
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Outside the amniotic ectoderm is a thin layer of mesoderm, which is continuous with that of the somatopleure and is connected by the body-stalk with the mesodermal lining of the chorion.
I. Embryology. 11. Development of the Fetal Membranes and Placenta 1918
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The cells of this layer proliferate rapidly, and extending medialward surround the notochord; at the same time they grow backward on the lateral aspects of the neural tube and eventually surround it, and thus the notochord and neural tube are enveloped by a continuous sheath of mesoderm, which is termed the membranous vertebral column.
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These pairs of "cubes" of the mesoderm are the first traces of the primitive segments or somites, the so-called "protovertebrae."
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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Down at the bottom, on either side of the hole, is a tissue called the presomitic mesoderm
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Down at the bottom, on either side of the hole, is a tissue called the presomitic mesoderm
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Note the absence of Hoxa13 and Hoxd13 from the corn snake mesoderm and the absence of Hoxd12 from the snake genome.
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