桑葚胚
| A+醫(yī)學(xué)百科 >> 桑葚胚 |
| 桑葚胚 | ||
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| 囊胚形成. 1 - 桑葚胚， 2 - 囊胚 | ||
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| 一顆受精的哺乳動(dòng)物卵子處于第一階段卵裂(剖面圖式講解：z.p.透明帶，p.gl.極體 a圖.二細(xì)胞時(shí)期 b圖.四細(xì)胞時(shí)期 c圖.八細(xì)胞時(shí)期 d、e圖. 桑葚胚時(shí)期 |
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| Gray's | subject #6 46 | |
| 日數(shù) | 3 | |
| 前體 | 合子 | |
| 發(fā)展結(jié)果 | 囊胚, 囊胚腔 | |
桑葚胚（拉丁文中的morus指的是桑葚的意思）是屬于胚胎的早期發(fā)育，包含囊胚腔外圍的細(xì)胞，包覆細(xì)胞外層的環(huán)帶稱為透明帶[1]。
桑葚胚是合子胚胎分裂一直到32細(xì)胞時(shí)期，整個(gè)形狀像一棵桑葚，所以被稱為桑葚胚[2]。 在受精數(shù)天之后，位于桑葚胚表面的細(xì)胞開始緊密接觸，讓細(xì)胞與細(xì)胞之間進(jìn)行胞橋小體連結(jié)與間隙連接，這個(gè)變化是非常細(xì)微的，并不易查覺，這個(gè)過程稱為致密化。[3][4]。在此之后桑葚胚的細(xì)胞釋放黏性液體，造成桑葚胚中央形成孔洞，成為囊胚[5][6]。囊胚的外層細(xì)胞會(huì)形成最初的胚胎上皮細(xì)胞(滋養(yǎng)外胚層)。然而有些細(xì)胞會(huì)存留在內(nèi)層，形成內(nèi)細(xì)胞群或是多潛能干細(xì)胞。其中內(nèi)細(xì)胞群細(xì)胞會(huì)形成胚體，而滋養(yǎng)外胚層則形成胎盤以及其他胚胎組織[7][8][9][10]。
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參見
參考資料
- ↑ Boklage, Charles E.. How New Humans Are Made: Cells and Embryos, Twins and Chimeras, Left and Right, Mind/Self/Soul, Sex, and Schizophrenia. World Scientific. 2009: p. 217. ISBN 9789812835130.
- ↑ Sherman, Lawrence S. et al.. Human embryology. 3rd. Elsevier Health Sciences. 2001: p. 20. ISBN 9780443065835.
- ↑ Chard, Tim & Lilford, Richard. Basic sciences for obstetrics and gynaecology. Springer. 1995: p. 18. ISBN 9783540199038.
- ↑ Mercader, Amparo et al.. Human embryo culture//Lanza, Robert & Klimanskaya, Irina. Essential stem cell methods. Academic Press. 2008: p. 343. ISBN 9780123747419.
- ↑ Patestas, Maria Antoniou & Gartner, Leslie P.. A textbook of neuroanatomy. Wiley-Blackwell. 2006: p. 11. ISBN 9781405103404.
- ↑ Geisert, R.D. & Malayer, J.R.. Implantation: Blastocyst formation//Hafez, B. &. Reproduction in farm animals. Wiley-Blackwell. 2000: p. 118. ISBN 9780683305777.
- ↑ Morali, Olivier G. et al.. Epithelium-Mesenchyme Transitions are Crucial Morphogenetic Events Occurring During Early Development//Savagner, Pierre. Rise and fall of epithelial phenotype: concepts of epithelial-mesenchymal transition. Springer. 2005: p. 16. ISBN 9780306482397.
- ↑ Birchmeier, Carmen et al.. Morphogenesis of epithelial cells//Paul, Leendert C. & Issekutz, Thomas B.. Adhesion molecules in health and disease. CRC Press. 1997: p. 208. ISBN 9780824798246.
- ↑ Nagy, András. Manipulating the mouse embryo: a laboratory manual. CSHL Press. 2003: pp. 60–61. ISBN 9780879695910.
- ↑ Connell, R.J. & Cutner, A.. Basic Embryology//Cardozo, Linda & Staskin, David. Textbook of female urology and urogynaecology. Taylor & Francis. 2001: p. 92. ISBN 9781901865059.
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