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| Neural plate | ||
|---|---|---|
| Carnegie stage | 9 | |
| Days | 19 | |
| Precursor | ectoderm | |
| Gives rise to | neural folds | |
| Dorlands/Elsevier | p_23/12645751 | |
In human embryology, formation of neural plate is the first step of neurulation. It is created by a flat thickening opposite to the primitive streak of the ectoderm.
During the stage of neural plate formation the embryo consist of three cell layers: the previously mentioned ectoderm that eventually forms the skin and neural tissues, the mesoderm that forms muscle and bone, and the endoderm that will form the cells lining the digestive and respiratory track. BMP-4 is a transforming growth factor that causes the cells of the ectoderm to differentiate into skin cells. Without BMP-4 the ectoderm cells would automatically develop into neural cells. Axial mesoderm cells under the ectoderm secrete inhibitory signals called chordin, noggin and follistatin. These inhibitory signals inhibit BMP-4 and as a result cause the overlying cells of the ectoderm to develop into neural cells. The cells in the ectoderm that circumvent these neural cells do not receive the BMP-4 inhibitor signals and as a result BMP-4 induces these cells to develop into skin cells.[1]
As the neural plate develops, it becomes surrounded by neural folds, which eventually create the cylindrical neural tube. This process is termed primary neurulation.
External links
- Swiss embryology (from UL, UB, and UF) hdisqueembry/triderm10
- Embryology at Temple EMBIII97/sld010
- Overview and diagram at brown.edu, with focus upon signaling
- Neural plate formation in mouse, at swarthmore.edu
References
- ^ Paul A. Wilson, Giorgio Lagna, Atsushi Suzuki and Ali Hemmati-Brivanlou. Concentration-dependent patterning of the Xenopus ectoderm by BMP4 and its signal transducer Smad1. Development: The Company of Biologists Limited 124, Great Britain. 1997. pg 3177-3184
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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 As such, some of the information contained herein may be outdated.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.
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- This page was last modified on 28 April 2008, at 20:58.
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