Lateral plate mesoderm

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Lateral plate mesoderm
Image19.png
Transverse section of a chick embryo of forty-five hours’ incubation.
* Chordamesoderm: yellow, at notochord.
* Paraxial mesoderm: red, at somite.
* Intermediate mesoderm: purple, near Wolffian duct.
* Lateral plate mesoderm: purple, near "Somatic mesoderm" and "Splanchic mesoderm".
Gray31.png
Model of human embryo 1.3 mm. long.. (Splanchic mesoderm labeled at left, somatic mesoderm at top right.)
Gray's subject #6 50
Carnegie stage 9
Precursor mesoderm
Gives rise to somatopleure, splanchnopleure
Dorlands/Elsevier h_22/12439212

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

Spaces within the lateral plate are enclosed and forms the intraembryonic coelom.

It is formed by the secretion of BMP-4 by the ectoderm.[1]

Serosal mesoderms

Lateral plate mesoderm gives rise to the serosal mesoderms.[2]

  • 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.[2]

  • 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

External links

References

  1. Tonegawa A, Funayama N, Ueno N, Takahashi Y (1997). "Mesodermal subdivision along the mediolateral axis in chicken controlled by different concentrations of BMP-4". Development. 124 (10): 1975–84. PMID 9169844.
  2. 2.0 2.1 Larsen, William J. (1998). Essentials of human embryology. Edinburgh: Churchill Livingstone. ISBN 0-443-07514-X.

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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