Enterocoelous pattern – coelom, Biology

Enterocoelous pattern – Coelom

In enterocoelous development of coelom the mesoderm arises in the embryo as paired lateral pouches growing out from the archenteron. The pouches grow 'and later get disconnected from the archenteron. The cavity of the pouch becomes the coelom. The inner wall of the pouch surrounds the developing alimentary canal and the outer layer lines the developing body wall. Those two layers become the future mesoderm. The animals possessing such cavities are known as enterocoelomates. Echinoderms hemichordates and chordates show this pattern of coelom development. The two different patterns of origin of coelom are another expression of the protostome - deuterostome dichotomy in evolution. Protostomes typically show schizocoelous origin of coelom while in deuterostome the coelom arises usually by enterocoely.

2248_Enterocoelous pattern – Coelom.png
Figure: Enterocoelous origin

The coelom provides the coelomic animals with a tube-within a tube body plan that allows greater flexibility when compared to animals that do not have internal body cavity. The fluid filled coelom additionally serves as a hydrostatic skeleton, in some forms such as worms, aiding in burrowing and inmovement. The coelom is of great significance in animal evolution. It is a stepping stone for evolution of more complex and larger forms.

Posted Date: 1/15/2013 2:25:21 AM | Location : United States







Related Discussions:- Enterocoelous pattern – coelom, Assignment Help, Ask Question on Enterocoelous pattern – coelom, Get Answer, Expert's Help, Enterocoelous pattern – coelom Discussions

Write discussion on Enterocoelous pattern – coelom
Your posts are moderated
Related Questions
Q. What is folic acid? Why is the anemia caused by deficiency of folic acid known as megaloblastic anemia? The folic acid when ionized it is called folate is a coenzyme that pa

P A TTERN OF GROWTH - 1 .       ISOMETRIC - In it an organ grows at the same rate as the rest of body. External form of body is not changed. eg. fish, locust. 2 .

What are the six criteria used to build a complete evolutionary branch of vertebrates? Dichotomy in each of the six following criteria builds the vertebrate evolutionary branch

Q. Why is it not correct to assert that the DNA self- replicates? The DNA is not completely self-sufficient in its duplication process because the replication does not occur wi

Explain the Procedure for Preparation of Bacterial Smear? Start the exercise by following the steps enumerated herewith. (1) Take properly washed and dried glass slides for

Pyruvate   carboxylase   is a mitochondrial   matrix enzyme whereas the other enzymes of gluconeogenesis are situated outside the mitochondrion. Thus oxaloacetate are produced by p

A complete motor neuron is deleted from a frog and placed in a large volume of normal physiological saline.  The neuron is healthy; it has a stable resting voltage of -70 mill

Find the initial osmotic pressure at room temperature for a cell if the only ions present are KCl and NaCl on either side of the membrane. Assume the concentrations for K+ and Na+

Borna disease Borna disease is fatal neurological disease of horses and sheep caused by a virus (RNA) of the family Bornaviridae and the disease is characterized by sub acute meni

Biochemistry : The chemistry  of  living organisms that covers all  the chemical reactions occurring  in our body.