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Difference Between Coelom and Pseudocoelom
Coelom vs Pseudocoelom
Coeloms and pseudocoeloms are words to explain the nature of the
body cavity in animals. These body
cavities are called coeloms. This cavity has surrounded by three
cell layers called Ectoderm (outer layer),
Endoderm (inner layer) and Mesoderm (middle layer) . These cell
layers are formed in embryo through the
process called gastrulation, and eventually these cell layers
become different parts of the body. This
coelom and pseudocoelom act as hydrostatic skeleton, and
disseminate the pressure through the body to
minimize the damages of the internal organs. Coelom acts as a
shock absorber and hydrostatic skeleton.
Longitudinal and circular waves can be transmitted efficiently
through the hydrostatic skeleton.
There are two types of animals, diploblastic animals and
triptoblastic animals, which have been categorized
according to the development of the embryo. Diploblastic
animals, as the name implies, have two cell
layers i.e. the outer layer, which is called ectoderm, and the
inner layer called endoderm. Triptoblastic
animals have an extra cell layer between Ectoderm and Endoderm
which is called Mesoderm. Only
triptoblastic animals have the body cavities.
Pseudocoelom
Animals that have pseudocoelom or false coelom are called
pseudocoelomate such as phylum Nematoda,
Acanthocephala, Entoprocta, Rotifera, Gastrotricha1. Although
they have a body cavity, it is not lined with
peritoneum or partially lined with peritoneum , which is derived
by embryonic mesoderm. This body cavity is
filled with fluid, which suspends the internal organs and
separates the digestive tract and outer body cell
wall. As embryology implies, the pseudocoelom is derived from
the blastocoel of the embryo.
Coelom
Animals that have true coelom are called Eucoelomates such as
phylum Annelida, Arthropoda, Mollusca,
Echinodermata, Hemichordata and Chordata. The fluid filled body
cavity is lined with peritoneum, which is
derived by embryonic mesoderm, and separates the digestive tract
and outer body cell wall. Internal
organs are suspended in the body cavity and help to develop
those. According to the embryology, Coelom
is derived from two different ways. One way is through the
splitting of the mesoderm, and the other way is
out pocketing of archenteron fusing together to form the
coelom.
What is the difference between Pseudocoelom and Coelom?
The main difference between Pseudocoelom and the coelom is,
pseudocoelom is not lined with the
peritoneum, which is derived by embryonic mesoderm, whereas
coelom is lined with the peritoneum.
Pseudocoelom is derived from the blastocoel of the embryo
whereas coelom is derived from two
different ways such as the splitting of the mesoderm and out
pocketing of archenteron fusing together to
form the coelom.
In coelomates, organs are suspended in a well organized manner,
in the body cavity, by attaching
