Everything about Mesoderm totally explained
The
germ layer mesoderm forms in the
embryos of
animals more complex than
cnidarians, making them
triploblastic. Mesoderm forms during
gastrulation when some of the cells migrating inward to form the
endoderm form an additional layer between the endoderm and the
ectoderm.
This key innovation evolved hundreds of millions of years ago and led to the evolution of nearly all large, complex animals. The formation of a mesoderm led to the formation of a
coelom. Organs formed inside a coelom (body cavity) can freely move, grow, and develop independently of the body wall while fluid cushions and protects them from shocks.
Categorizing animals
Not all triploblastic animals have a coelom, like the simplest animals with organs that form from three tissue layers:
flatworms. Three different configurations of mesoderm in relation to ectoderm form a method of categorizing animals.
- Acoelomates
- no coelom
- tissues and organs packed between gut and body wall
- Pseudocoelomates
- false coelom
- unlined or partially lined body cavity between gut and body wall
- Coelomates
- proper coelom
- lined cavity between gut and body wall
Derivatives
General
Note: Not all triploblasts produce all of the items listed.
bones
most of the circulatory system, including the heart and major blood vessels
connective tissues of the gut and integuments
mesenchyme
mesothelium
muscles
peritoneum (lining of the coelom)
reproductive system
urinary system, including the kidneys
Vertebrates
In addition to the general list, the mesoderm of a developing vertebrate differentiates into the following:
Chordamesoderm
Paraxial mesoderm
Intermediate mesoderm
Lateral plate mesodermFurther Information
Get more info on 'Mesoderm'.
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