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  Encyclopedia of Keywords > Allantois > Yolk Sac   Michael Charnine

Keywords and Sections
FEED
FERROPORTIN1
VITELLINE DUCT
DEFINITIVE YOLK SAC
PRESENT
BIRDS
BLOOD CELLS
FORMATION
EMBRYONIC DEVELOPMENT
HEMATOPOIETIC STEM CELLS
PREGNANT FEMALES
DEVELOPING FETUS
EMBRYOS
DRAIN BLOOD
LINING
DEVELOPMENT
REMNANTS
AMNIOTIC CAVITY
FORM
FETUS
CELLS
SMALL CRUSTACEANS
PLACENTA
HYPOBLAST
AMNION
EMBRYO
ALLANTOIS
YOLK SAC
Review of Short Phrases and Links

    This Review contains major "Yolk Sac"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. The yolk sac is an extraembryonic tissue that produces blood cells similar to the structure that surrounds the yolk in birds. (Web site)
  2. The yolk sac is first visible at 5 weeks and it is always present by 5 weeks and 4 days. (Web site)
  3. The primary yolk sac is pushed to the opposite side of the embryo (the abembryonic pole), while a new cavity forms, the secondary or definitive yolk sac.
  4. Part of the yolk sac is incorporated into the embryo as the primordium of the gut. (Web site)

Feed

  1. Newly hatched salmon continue to feed off of the nutrients from their yolk sac until they have developed enough to hunt small prey. (Web site)

Ferroportin1

  1. The gene, ferroportin1, encodes a multiple-transmembrane domain protein, expressed in the yolk sac, that is a candidate for the elusive iron exporter.

Vitelline Duct

  1. The yolk sac remains connected to the gut tube via the vitelline duct. (Web site)

Definitive Yolk Sac

  1. Definitive yolk sac = umbilical vesicle (yolk sac becomes small and inconspicuous). (Web site)

Present

  1. The embryonic pole, yolk sac and heart activity are now always present. (Web site)

Birds

  1. Yolk Sac It is well developed in reptiles, birds and prototherians. (Web site)

Blood Cells

  1. In developing embryos, blood formation occurs in aggregates of blood cells in the yolk sac, called blood islands. (Web site)

Formation

  1. The yolk sac membrane of mammals is the site of early formation of blood cells, which later migrate to the embryo. (Web site)
  2. During foetal development, the formation of blood cells (haemopoiesis) commences in wall of the yolk sac. (Web site)
  3. As gastrulation continues, mesodermal cells migrate around the endodermal pouch and complete the formation of the yolk sac. (Web site)

Embryonic Development

  1. During early embryonic development, primordial germ cells (PGCs) from the dorsal endoderm of the yolk sac migrate along the hindgut to the gonadal ridge. (Web site)

Hematopoietic Stem Cells

  1. Hematopoietic stem cells originate from mesenchymal tissue in the yolk sac during very early embryonic life. (Web site)

Pregnant Females

  1. Pregnant females develop a kind of yolk sac in their wombs, which delivers nutrients to the embryo.

Developing Fetus

  1. In a developing fetus, the homepoietic centers are found in the yolk sac, spleen, and liver.

Embryos

  1. Embryos were genotyped by PCR of DNA isolated from the yolk sac or the entire embryo subsequent to in situ hybridization.

Drain Blood

  1. Its initial blood supply is primarily from the vitelline veins that drain blood from the yolk sac. (Web site)

Lining

  1. The hypoblast, or primitive endoderm, will give rise to extraembryonic structures only, such as the lining of the primary yolk sac.

Development

  1. Palis J, Robertson S, Kennedy M, Wall C, Keller G. Development of erythroid and myeloid progenitors in the yolk sac and embryo proper of the mouse. (Web site)

Remnants

  1. The remnants of the primary yolk sac are called exocoelomic vesicles. (Web site)

Amniotic Cavity

  1. Connecting Stalk • The embryo (along with the amniotic cavity and yolk sac) remains attached to the trophoplast only by extra-embryonic mesoderm. (Web site)

Form

  1. Hypoblastic cells migrate along the inner surface of the cytotrophoblast to form the primary yolk sac. (Web site)

Fetus

  1. The fetal pole is a thickening on the margin of the yolk sac of a fetus during pregnancy.
  2. In the early fetus, erythropoiesis takes place in the mesodermal cells of the yolk sac.

Cells

  1. The immature ova originate from cells from the dorsal endoderm of the yolk sac. (Web site)
  2. Week 2: Yolk sac - Vitelline duct - Bilaminar disc Embryonic stem cells differentiate into cells in various body organs. (Web site)

Small Crustaceans

  1. Within four to five days, the yolk sac is absorbed and the fry begins to swim and feed on small crustaceans. (Web site)

Placenta

  1. Maternal hypercoagulability is a possible cause of miscarriage during the eighth and ninth weeks of pregnancy, when the placenta replaces the yolk sac. (Web site)

Hypoblast

  1. One is the Hypoblast, which lies next to the Blastocoel and gives rise to the Extraembryonic Endoderm, which forms the Yolk sac. (Web site)
  2. The hypoblast spreads out and covers the blastocoel to form the yolk sac.
  3. The hypoblast, or primitive endoderm, will give rise to extraembryonic structures only, such as the lining of the yolk sac. (Web site)

Amnion

  1. These cells establish contact with the extraembryonic mesoderm covering the amnion and yolk sac. (Web site)
  2. The trophoblast also develops into three membranes: the amnion, the chorion, and the yolk sac membrane.

Embryo

  1. It makes blood for the embryo until the liver forms and portions of the yolk sac contribute to the development of the gut and primitive gonads.
  2. By the fourth week, the embryo, amnion, and yolk sac are suspended within an expansive, fluid-filled chamber. (Web site)
  3. Embryo lies between amnion and yolk sac Double bubble sign Sign of duodenal atresia and other forms of duodenal obstruction.

Allantois

  1. The umbilical cord develops from and contains remnants of the yolk sac and allantois (and is therefore derived from the same zygote as the fetus). (Web site)
  2. The umbilical cord contains the allantois and yolk sac as well as circulatory system structures that connect the embryo to the placenta. (Web site)
  3. This endoderm lined cavity is incorporated into the embryo, while the yolk sac and the allantois remain temporarily by outside the embryo. (Web site)

Yolk Sac

  1. The inner cell mass gives rise to the embryo proper, the amnion, yolk sac and allantois, while the trophoblast will eventually form the placenta.
  2. The tissues of the embryo are all derived from the inner cell mass as are the amnion and major components of the yolk sac and allantois. (Web site)
  3. They develop from the zygote but do not participate in the formation of the embryo or fetus — except for parts of the yolk sac and allantois. (Web site)

Categories

  1. Allantois
  2. Nature > Life > Animals > Embryo
  3. Amnion
  4. Hypoblast
  5. Inner Cell Mass
  6. Books about "Yolk Sac" in Amazon.com

Book: Keywen Category Structure


  Short phrases about "Yolk Sac"
  Originally created: July 27, 2008.
  Links checked: April 12, 2013.
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