Epiblast

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Epiblast
Section through the embryo. (Epiblast visible but not labeled.)
Image:Cell differentiation gastrula.PNG
Cell differentiation
Carnegie stage	3
Days	8
Precursor	inner cell mass
Gives rise to	ectoderm, mesoderm
Dorlands/Elsevier	e_11/12336502

In embryology, the epiblast is a class of cells present during gastrulation. At this stage, the epiblast and hypoblast together form the bilaminar disk of the developing embryo. Both layers are derived from the inner cell mass.

Some sources state that only epiblast cells give rise to the three germ layers of the embryo,^[1], some state that it gives rise to ectoderm and mesoderm,^[1], while others state that it gives rise to ectoderm only.^[1]

In mammalian embryogenesis, the columnar cells of the epiblast are adjacent to the trophoblast, while the cuboidal cells of the hypoblast are closer to the Blastocoele.

See also

• Embryogenesis
• Mammalian embryogenesis

References

External links

• http://www.iscr.ed.ac.uk/images/tilo_kunath/Tilo-Web-figure-1.gif
• http://www.embryology.ch/allemand/iperiodembry/carnegie02.html
• http://www.med.umich.edu/lrc/coursepages/M1/embryology/embryo/04secondweek.htm
• http://isc.temple.edu/marino/embryology/EMBII97/sld005.htm

v • d • e Developmental biology > Human embryogenesis (development of embryo) and development of fetus (some dates are approximate - see Carnegie stages and a timeline)
Week 1	Fertilization - Egg activation - Zygote - Cleavage - Morula - Blastula (Blastomere) - Blastocyst - Inner cell mass
Week 2	Bilaminar disc (Hypoblast, Epiblast)
Week 3 (Trilaminar embryo, germ layers)	Archenteron/Primitive streak (Primitive pit, Primitive knot/Blastopore, Primitive groove) - Gastrula/Gastrulation - Regional specification Ectoderm: Surface ectoderm - Neuroectoderm - Somatopleure - Neurulation - Neural crest Endoderm: Splanchnopleure Mesoderm: Chorda- - Paraxial (Somite/Somitomere/Sclerotome/Myotome/Dermatome) - Intermediate - Lateral plate (Intraembryonic coelom, Splanchnopleure/Somatopleure)
Extraembryonic/uterus	Trophoblast (Cytotrophoblast, Syncytiotrophoblast) Blastocoele - Yolk sack/exocoelomic cavity - Heuser's membrane - Extraembryonic coelom - Vitelline duct Umbilical cord (Umbilical artery, Umbilical vein, Wharton's jelly) - Allantois Placenta - Decidua (Decidual cells) - Chorionic villi/Intervillous space - Gestational sac (Amnion/Amniotic sac/Amniotic cavity, Chorion)
Histogenesis	Programmed cell death - Stem cells - Germ line development
Organogenesis	Limb development: Limb bud - Apical ectodermal ridge/AER other structures: Eye development - Cutaneous structure development - Heart development - Development of the urinary and reproductive organs

de:Epiblast

Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .