Cœlome
The cœlome is the general cavity, true completion bordered by the Mésoderme, which forms the membrane of it. The animals which have true a cœlome, like the Annélides, the Mollusques or the Chordés, are Cœlomate S (or Eucoelomates).
Advantages conferred by the presence of a coelome
The cœlome confers several advantages on the animals. It leaves a space where the bodies can grow. The fluid which it contains facilitates circulation, and can be used to plug the temperature variations and to absorb the shocks. It makes it possible to build an effective hydrostatic skeleton. The fluid which bathes the internal bodies can be filtered to eliminate metabolic waste. Lastly, it makes it possible the digestive tract to be driven independently of the body of the animal.
The cœlome at the human embryo
At the human Embryo, one distinguishes two cœlomes: the intra-embryonic cœlome which is dug in the Mésoblaste side blades, which gives rise to pleural the cavities , pericardial and péritonéale. The extra-embryonic cœlome is the part of the cœlome dug in the mésoblaste located apart from the embryo. This cœlome is limited by the intra-embryonic Somatopleure and the intra-embryonic Splanchnopleure.
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