Blastocyst
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| Blastocyst | ||
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| Carnegie stage | 3 | |
| Days | 5 | |
| MeSH | Blastocyst | |
| Dorlands/Elsevier | b_14/12187695 | |
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Overview
The blastocyst is an early stage of the mammalian development that occurs at the beginning of pregnancy. It is the structure formed in early embryogenesis, after the formation of the blastocoel, but before implantation. It possesses an inner cell mass, or embryoblast which subsequently forms the embryo, and an outer cell mass, or trophoblast whoch forms the placenta. The human blastocyst comprises 70-100 cells. It is preceded by a zygote, the fertilized egg cell, and succeeded by an embryo. Other definitions consider the blastocyst an intermediate stage of the embryo, and begin using the term blastocyst at day 5 (16-20 cells.)[1]
Recently the inner cell mass has become a source for embryonic stem cells.
References
- ↑ UNSW Embryology- Week 1. Retrieved on 2007-12-30.
External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
de:Blastozystenl:Blastocyste no:Blastocystsk:Blastocysta sr:Бластоцист fi:Alkiorakkula
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 .
