Lateral plate mesoderm
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2008-05-28T19:50:47Z
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{{Infobox Embryology |
Name = {{PAGENAME}} |
Latin = |
GraySubject = 6 |
GrayPage = 50 |
Image = Image19.png |
Caption = Transverse section of a chick embryo of forty-five hours’ incubation.<BR>* ''[[Chordamesoderm]]:'' yellow, at [[notochord]].<BR>* ''[[Paraxial mesoderm]]:'' red, at [[somite]].<BR>* ''[[Intermediate mesoderm]]:'' purple, near [[Wolffian duct]].<BR>* ''[[Lateral plate mesoderm]]:'' purple, near "Somatic mesoderm" and "Splanchic mesoderm". |
Image2 = Gray31.png |
Caption2 = Model of human embryo 1.3 mm. long.. (Splanchic mesoderm labeled at left, somatic mesoderm at top right.) |
System = |
CarnegieStage = 9 |
Days = |
Precursor = [[mesoderm]] |
GivesRiseTo = [[somatopleure]], [[splanchnopleure]] |
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DorlandsPre = h_22 |
DorlandsSuf = 12439212 |
}}
'''Lateral plate mesoderm''' (or '''hypomere''') is a type of [[mesoderm]] that is found at the periphery of the [[embryo]].
==Division into layers==
It will split into two layers, the somatic layer/mesoderm and the splanchnic layer/mesoderm
* The ''somatic layer'' forms the future body wall.
* The ''splanchnic layer'' forms the [[circulatory system]] and future [[gut wall]].
Spaces within the lateral plate are enclosed and forms the intraembryonic [[coelom]].
It is formed by the secretion of [[BMP-4]] by the ectoderm.<ref name="pmid9169844">{{cite journal |author=Tonegawa A, Funayama N, Ueno N, Takahashi Y |title=Mesodermal subdivision along the mediolateral axis in chicken controlled by different concentrations of BMP-4 |journal=Development |volume=124 |issue=10 |pages=1975–84 |year=1997 |pmid=9169844 |doi=}}</ref>
==Serosal mesoderms==
Lateral plate mesoderm gives rise to the serosal mesoderms.<ref name="Larsen">{{cite book |author=Larsen, William J. |title=Essentials of human embryology |publisher=Churchill Livingstone |location=Edinburgh |year=1998 |pages= |isbn=0-443-07514-X |oclc= |doi=}}</ref>
::* forms a ventral layer associated with [[endoderm]], the [[splanchnopleuric]] mesoderm. This forms the viscera and heart
::*forms a dorsal layer associated with [[ectoderm]], the [[somatopleuric]] mesoderm. This forms the body wall lining and dermis.
::*Abdominal portion becomes contained in [[dorsal mesentery]], part of the serosal mesoderm.
::* When the two layers form, a cardiogenic plate is visible. Later, this will form the myocardial primordium, which will contribute to the tubular heart.
==Cavities==
In the 4th week the coelom divides into [[pericardial]], [[pleural]] and [[peritoneal]] cavities.<ref name="Larsen"> </ref>
::* First partition: is the [[septum transversum]].
:::*This will be translocated later into the diaphragm and [[ventral mesentery]].
:::*Divides the coleom into primitive pericardial and peritoneal cavities
::* pleuropericardial folds appear on the lateral wall of primitive pericardial cavity, which will eventually cause a partition to form the pericardial and pleural cavities.
::*Communication between these partitions formed by the pericardioperitoneal canals. However, pleuroperitoneal membranes will grow to fuse with the septum transversarium to close off these canals.
* At day 22, [[lung bud]] forms, remaining ensheathed in a splachnopleuric mesoderm
==See also==
* [[Serous membrane]]
==External links==
* {{EmbryologySwiss|hdisqueembry/triderm08}}
* [http://www.palaeos.com/Vertebrates/Lists/Glossary/Early_Development.html Overview and diagram at palaeos.com]
* [http://arnica.csustan.edu/embryo/Lectures/10_Lateral_plate_mesoderm_and_endod.htm Outline at csustan.edu]
==References==
<references/>
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{{Embryology}}[[Category:Embryology]]
[[Category:Developmental biology]]