Lateral plate mesoderm

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Lateral plate mesoderm
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".
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
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.

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.

Between the two is the coelom.


  • Formed by the secretion of BMP-4 by the ectoderm.
  • Spaces within the lateral plate are enclosed and forms the intraembryonic coelom.
  • Lateral plate mesoderm gives rise to the serosal mesoderms
  • 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.

  • In the 4th week the coelom divides into pericardial, pleural and peritoneal cavities.
  • 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


[edit] See also

[edit] External links

[edit] References

Human Embryology, Larson


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