Epiblast


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epiblast

[′ep·ə‚blast]
(embryology)

Epiblast

 

(1) In botany, a squamous growth on the outer side of the embryo of many herbs. The epiblast covers the plumule partially or completely. It is well expressed in most bread grains and meadow grasses, for example, rice, Poa, barley, and bamboo. It is absent in millet, sorghum, corn, and canes. The epiblast protects the plumule. During germination it swells greatly, accumulating moisture like a sponge and participating in dehiscence of the caryopsis. The morphological nature of the epiblast is unclear.

(2) In zoology, the outer epithelial layer of the discoblastula, or blastoderm, in scorpions, cephalopods, mollusks, sharks, and bony fishes, as well as in most reptiles, birds, and lower mammals. The epiblast contains ectodermal and mesodermal material. It is isolated from the cells of the internal layer, or hypoblast, by a cavity known as the blastocoel.

References in periodicals archive ?
8###Gastrula###Two layered structure was appeared with an outer the epiblast, and inner one the
As noted earlier, after blastocoele formation the hypoblast forms the yolk sac and the epiblast begins to differentiate into the three major germ cell layers.
embryo mesocotyl internode negligible, epiblast present, scutellar tail absent, embryonic leaf margins overlapping), a pattern typical of Oryzeae, not unknown in Pooideae, and unrecorded within the PACC clade.
To this end, I will use mouse embryos and murine epiblast stem cells, which are analogous to human ESC (hESCs).
LOS ANGELES, Calif, October 24, 2013 -- Researchers have long been searching for biotech's version of the fountain of youth: ways to encourage embryonic stem cells (ESCs) and epiblast stem cells (EpiSCs) to endlessly self-renew, or divide to produce more stem cells.
The mouse cells that we utilized, which are pluripotent epiblast stem cells, can make any cell type in body," explained Paul Tesar, an assistant professor of genetics at Case Western Reserve and senior author of the stud.
Epiblast The cells that give rise to the three germ layers of the embryo (ectoderm, mesoderm, and endoderm).
Stern hypothesizes that local movement in the epiblast, the epithelial cells, are "responsible for positioning and shaping the primitive streak" by pushing in among neighboring cells and this "can also explain the polonaise movements without the need for long-range gradients" (p.
Embryo development is rapid and the different organs such as scutellum, epiblast, vascular bundle, and root apex are differentiated by 6 DAF.
This migration occurs along the anterior-posterior portions of the epiblast--a portion of the inner cell mass--and the concentration of migrating cells results in the visible "primitive streak," which, while having a polarity ("cephalic," or head, and "caudal," or tail), is at this point merely a transitory part of the epiblast.
Multiple Agilent Microarray Genomic Platforms, Online Design Tool Used to Examine Mouse Epiblast Cells and Human Embryonic Stem Cells for Similarities, Differences
Then, in 2007, researchers discovered a new type of primitive mouse stem cell known as an epiblast stem cell, derived from cells just a couple of days older than classic mouse ESCs.