mesoderm


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mesoderm

 [mez´o-derm]
the middle of the three primary germ layers of the embryo, lying between the ectoderm and entoderm; from it are derived the connective tissue, bone, cartilage, muscle, blood and blood vessels, lymphatics, lymphoid organs, notochord, pleura, pericardium, peritoneum, kidneys, and gonads. adj., adj mesoder´mal, mesoder´mic.
somatic mesoderm the outer layer of the developing mesoderm.
splanchnic mesoderm the inner layer of the developing mesoderm.

mes·o·derm

(mez'ō-derm),
The middle of the three primary germ layers of the embryo (the others being ectoderm and endoderm); mesoderm is the origin of connective tissues, myoblasts, blood, the cardiovascular and lymphatic systems, most of the urogenital system, and the lining of the pericardial, pleural, and peritoneal cavities.
[meso- + G. derma, skin]

mesoderm

(mĕz′ə-dûrm′, mĕs′-)
n.
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.

mes′o·der′mal, mes′o·der′mic adj.

mes·o·derm

(mez'ō-dĕrm)
The middle of the three primary germ layers of the embryo (the others being ectoderm and endoderm); mesoderm is the origin of all connective tissues, all musculature, blood, cardiovascular and lymphatic systems, most of the urogenital system, and the lining of the pericardial, pleural, and peritoneal cavities.
Synonym(s): mesoblast.
[G. meso- middle + G. derma, skin]

mesoderm

The intermediate of the three primary germ layers of the developing embryo, lying between the outer ECTODERM and the inner ENDODERM. Mesoderm develops into the bones and muscles, the heart and blood vessels and most of the reproductive system.

mesoderm

the layer of embryonic cells lying between ECTODERM and ENDODERM in all higher animals (all METAZOA except COELENTERATES) giving rise to muscle, the blood system, connective tissues, the kidney, the dermis of the skin and the axial skeleton. The mesoderm is often split into two layers with the COELOM in between.

mesoderm

One of the three primary germinal layers of an embryo from which the eye is derived. It eventually forms the extraocular muscles and the orbital and ocular vasculature. See ectoderm.

mes·o·derm

(mez'ō-dĕrm)
Middle of three primary germ layers of embryo (the others being ectoderm and endoderm).
[G. meso- middle + G. derma, skin]
References in periodicals archive ?
The CW rotation of cardiac mesoderm stage cells corresponds to the CW rotation of the heart tube during development [6].
The beginning of each treatment should be concerned with the balancing of the embryonic germinal tissue layers such as the ectoderm, mesoderm, and endoderm, speaking of the colon and internal organs.
The septum transversum mesoderm is known to support the growth of the liver bud (11-14).
The initial set of hematopoietic stem cells (HSCs) is initially formed during embryogenesis in mesoderm and could involve various anatomical sites (yolk sac, aorta-gonad-mesonephros region, placenta, and fetal liver), after which the HSCs finally colonize the bone marrow at birth [94, 95].
The amniotic cavity develops from epiblast and three germ layers endoderm mesoderm and ectoderm are developed from hypoblst.8
Histologically all of the mature teratomas consisted of tissues derived from ectoderm and mesoderm.
The blastocyst, being a disc with two cell layers, is converted to a trilaminar plate by the formation of a third layer that will be the future mesoderm. This is triggered by the appearance of a primitive streak towards which cells migrate and which they pass through.
The researchers were able to differentiate the stem cells into expressing key markers of the intermediate mesoderm, which are the early cells that form the kidneys, and then induce diem further into expressing the marker SIX2, which is critical in kidney differentiation, according to their article in the Journal of the American Society of Nephrology.
In its earliest stages of development, an embryo segregates into three main layers of tissue: an outer one (ectoderm) that will form the skin and nervous system, an inner layer (endoderm) that becomes the digestive tract, and an in-between layer (mesoderm) that eventually forms muscles, bones, and other organs.
"Our goal was to develop a simple, efficient, and reproducible method of differentiating human pluripotent stem cells into cells of the intermediate mesoderm, the earliest tissue in the developing embryo that is fated to give rise to the kidneys," said Dr.
As a proof of principle, the authors correctly detected trisomy 21 by assessing the methylation density of chromosome 21 and correctly deduced the imprinting status of 4 selected loci: H19 [2] [H19, imprinted maternally expressed transcript (non-protein coding)], KCNQ1OT1 [KCNQ1 opposite strand/antisense transcript 1 (non-protein coding)], MEST (mesoderm specific transcript), and GNAS (GNAS complex locus).
In the present case, an explanation of these additional heads of the SCM may be due to abnormal splitting in the mesoderm of post-sixth branchial arch (7).