Epiblast vs. Hypoblast

Epiblastnoun

The outer layer of a blastula that, after gastrulation, becomes the ectoderm.

Epiblastnoun

The outer layer of the blastoderm; the ectoderm. See Blastoderm, Delamination.

Epiblast

In amniote animal embryology, the epiblast (also known as the primitive ectoderm) is one of two distinct layers arising from the inner cell mass in the mammalian blastocyst or from the blastodisc in reptiles and birds. It derives the embryo proper through its differentiation into the three primary germ layers, ectoderm, mesoderm and endoderm, during gastrulation.

Hypoblastnoun

(embryology) A type of tissue that forms from the inner cell mass and later is incorporated into the endoderm

Hypoblastnoun

The inner or lower layer of the blastoderm; - called also endoderm, entoderm, and sometimes hypoderm. See Illust. of Blastoderm, Delamination, and Ectoderm.

Hypoblastnoun

the inner germ layer that develops into the lining of the digestive and respiratory systems

Hypoblast

In amniote embryology, the hypoblast, is one of two distinct layers arising from the inner cell mass in the mammalian blastocyst, or from the blastodisc in reptiles and birds. The hypoblast gives rise to the yolk sac, which in turn gives rise to the chorion.The hypoblast is a layer of cells in fish and amniotes embryos.