How Many Tissue Layers Do Cnidarians Have

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The epidermis and the gastrodermis. Between both layers they have the mesoglea which is a connective layer.


Cnidarian Structure And Function Advanced Ck 12 Foundation

All cnidarians have two membrane layers in the body.

. Cnidarians have two distinct morphological body plans known as polyp which are sessile as adults and medusa which are mobile. These will later develop into certain tissue types organs and organ systems during a process called organogenesis. In contrast to bilaterians cnidarians owe most of their contractile power to epitheliomuscular or myoepithelial cells that make up both epithelial body layers Brusca et al 2016.

During gastrulation the digestive cavity and germ layers are formed. Some species exhibit both body plans in their lifecycle. Hox genes are responsible for determining the general body plan such as the number of body segments of an animal the number and placement of appendages and animal head-tail.


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