amniotic folds

amniotic folds
Lateral folds of the amnion that meet to enclose the germ band in the ovum.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • amniotic raphe — the line of junction of the amniotic folds in the amnion of those vertebrates in which it is formed by folding …   Medical dictionary

  • amniotic umbilicus — the oval aperture formed by converging amniotic folds …   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

  • Chorionic villi — Diagram of a transverse section, showing the mode of formation of the amnion in the chick. The amniotic folds have nearly united in the middle line. Ectoderm, blue; mesoderm, red; entoderm and notochord, black. (Vill …   Wikipedia

  • entypy — A type of gastrulation seen in some early mammalian embryos in which the endoderm covers the embryonic and amniotic ectoderm; part of the preplacental trophoblast may also be covered. [G. entype, pattern] * * * en·ty·py ent ə pē …   Medical dictionary

  • entypy — ˈentəpē noun ( es) Etymology: en (II) + typy : a method of amnion formation in certain mammals in which the embryonic knob invaginates into the yolk sac and no amniotic folds are formed compare amnion …   Useful english dictionary

  • human embryology — ▪ biology Introduction       the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth.       The human body, like that of most animals, develops from a single cell produced by the union of… …   Universalium

  • animal development — Introduction  the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by …   Universalium

  • renal system — ▪ anatomy Introduction  in humans (human body), organ system that includes the kidneys, where urine is produced, and the ureters, bladder, and urethra for the passage, storage, and voiding of urine.       In many respects the human excretory, or… …   Universalium

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