Enterocoelous pattern – coelom, Biology

Assignment Help:

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.


Related Discussions:- Enterocoelous pattern – coelom

State about the lengthy administration of test battery, State about the len...

State about the lengthy administration of test battery The lengthy administration of test battery may be unsuitable for some individuals (such as demented or psychiatric patien

Types of eggs, TYPES OF EGGS Different species of animal has different ...

TYPES OF EGGS Different species of animal has different type of eggs. They are classified on the following basis - 1 .         ON THE BASIS OF AMOUNT OF YOLK On the ba

Describe any three adaptations of mangroves, Name and describe any three ad...

Name and describe any three adaptations of mangroves to the conditions prevailing in the Sunderbans.

What is rounded st depression, Q. What is Rounded ST Depression? A roun...

Q. What is Rounded ST Depression? A rounded ST-segment depression pattern in the CM5 lead, as well as in the other leads, is common and is often associated with ischaemia. This

Opiate narcotics - psychological drug dependence, OPI A T E NARCOTICS - ...

OPI A T E NARCOTICS - They suppress brain activity and relieve pain popularly known as pain killers. They are sedative and astringent in nature. An astringent cause

How the molecule would increase in mass slightly, Suppose many of the atoms...

Suppose many of the atoms of nitrogen in a double-stranded molecule of DNA, of isotope N-14, were replaced with the isotope N-15. What afffect would this have? a) The nitrogeneo

Ventricular septal defect, A newborn baby with a patent foramen ovale or a ...

A newborn baby with a patent foramen ovale or a ventricular septal defect might be cyanotic (blue). Will a two-year-old with these defects also be cyanotic? Explain your answer.

Which blood vessels carry venous blood to the heart, Q. What are the blood ...

Q. What are the blood vessels that carry venous blood to the heart? What is the blood vessel that collects arterial blood from the heart? The blood vessels that debouch in the

Describe the main cycle in metabolism of cornea, Describe the main cycle in...

Describe the main cycle in metabolism of cornea. Main Cycle: Glycolysis is represented by the central chain and involves the anaerobic conversion of glucose into pyruvic

Two dimensional gene scanning method, Two dimension gene scanning technique...

Two dimension gene scanning technique is a high resolution system for finding of mutational variants in multiple genes. This method is on the basis of combination of extensive poly

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd