- extraembryonic blastoderm
- the region of the blastoderm forming membranes rather than the embryo proper.
Medical dictionary. 2011.
extraembryonic blastoderm
Look at other dictionaries:
blastoderm, blastoderma — The thin, disk shaped cell mass of a young embryo and its extraembryonic extensions over the surface of the yolk; when fully formed, all three primary germ layers (ectoderm, endoderm, and mesoderm) are present … Medical dictionary
amniotic fold — n any of the folds that consist of ectoderm and the outer layer of mesoderm, that arise from the extraembryonic blastoderm first at the head, then at the tail, and finally on each side, and that form the amnion and much of the chorion * * * the… … Medical dictionary
amniotic fold — noun : one of the folds consisting of ectoderm and the outer layer of mesoderm that arises from the extraembryonic blastoderm first at the head, then at the tail, and finally on each side and that gives rise to the amnion and much of the chorion … Useful english dictionary
membrane — 1. A thin sheet or layer of pliable tissue, serving as a covering or envelope of a part, as the lining of a cavity, as a partition or septum, or to connect two structures. SYN: membrana [TA]. 2. SYN: biomembrane. [L. membrana, a skin or m … Medical dictionary
Germ cell — Germ cells are progenitors of the gametes. These singled out cells move through the gut to the developing gonads and undergo mitotic proliferation followed by meiosis and differentiation into either eggs or sperm (mature gametes). Plants do not… … Wikipedia
proamnion — An area of the extraembryonic membranes beneath, and in front of, the developing head of a young embryo that remains without mesoderm for some time. * * * pro·am·ni·on am nē .än, ən n, pl ni·ons … Medical dictionary
sinus — 1. [TA] A channel for the passage of blood or lymph, without the coats of an ordinary vessel; e.g., blood passages in the gravid uterus or those in the cerebral meninges. 2. [TA] A cavity or … Medical dictionary
