What's the difference between epiblast and periblast?

Epiblast


Definition:

  • (n.) The outer layer of the blastoderm; the ectoderm. See Blastoderm, Delamination.

Example Sentences:

  • (1) Expansion of the cell sheet following attachment, and the fusion of epiblasts advancing toward each other, does not require the presence of mineralocorticoid.
  • (2) At the midgastrula stage the epiblast cells have the highest dry weight due to the highest protein concentration in the cytoplasm and the biggest cell volume.
  • (3) Proliferation occurs throughout the extra-embryonic epiblast during the expansion period.
  • (4) These observations are consistent with an epiblast origin for the avian germ line, and are strikingly similar to those reported for the early mouse embryo using the same antibody (Hahnel & Eddy, 1986).
  • (5) IGFBP-2 mRNA was detected throughout the epiblast of the egg cylinder as early as e7, when IGF-II expression was restricted to trophectoderm and other extraembryonic cells.
  • (6) It is also noted that the inadequate differentiation of the epiblast and endoderm would not have been apparent without microscopic examination.
  • (7) Both X chromosomes continued to replicate synchronously in the embryonic ectoderm or epiblast at this stage.
  • (8) The resulting space is not homologous with the primordial amniotic cavity; instead, it is a transitory tropho-epiblastic cavity.
  • (9) After the yolk has been covered, the epiblast continues to grow, with proliferation restricted largely to band just distal to the advancing edge of the area vasculosa.
  • (10) Primordial germ cells in the mouse are known to be derived from the epiblast.
  • (11) In general, the dorsoventral orientation of the previously induced epiblast was retained, but the orientation of the competent epiblast cells was more flexible and could be influenced by the neighbouring neuralised cells.
  • (12) The results of this study show that the epiblast cells of chick blastoderm at Hamburger-Hamilton stage 1 contain macrobodies which themselves contain particles resembling the 'lining bodies' described by Bellairs.
  • (13) At one time presumed to be derived from a common "neural" ancestor, all are now deemed to be "neuroendocrine-programmed," arising either in the embryonic epiblast itself or in one of its principal descendants.
  • (14) Epiblastic cells never gave rise to skeletal myotubes.
  • (15) The definitive amniotic epithelium forms by the upfolding and mitotic proliferation of the margins of the epiblastic disc; this process is completed in 11-day rhesus, and 9-day human, blastocysts.
  • (16) At 108 h and 120 h pc the polar trophoblast (Rauber's layer) is an intact epithelium overlying the epiblast of the inner cell mass.
  • (17) The epiblast cells of the optic bud do not migrate into the brain and the lamina is formed by the proliferation of the central imaginal disc.
  • (18) By the time of primitive streak formation (stage 4-5) the dorsal surface of the epiblast displayed increased binding sites, while the frequency of sites on the ventral surface of the endoblast was reduced.
  • (19) A microinjection technique is described for fate mapping the epiblast of avian embryos.
  • (20) Injection in situ of a short-term lineage label (horse radish peroxidase) into single epiblast cells at 6.7 days p.c.

Periblast


Definition:

  • (a.) The protoplasmic matter which surrounds the entoblast, or cell nucleus, and undergoes segmentation.

Example Sentences:

  • (1) Specialized accumulations of membranes lie in the marginal periblast, and it is suggested that they play a role in cell membrane formation.
  • (2) The subgerminal periblast possesses a greater proportion of yolk to cytoplasm than do the cells proper, but it merges with the cytoplasm at the incomplete borders of the 'open' cells.
  • (3) (2) The periblastic region, which also exhibits microvillous projections, is 250-550 micron wide and consists of numerous (80-120) lacunae that are 10-60 micron in diameter and up to 20 micron in depth.
  • (4) (3) At the outer periblastic region, the microvillous projections are less numerous.

Words possibly related to "epiblast"

Words possibly related to "periblast"