Umbrella (biology)

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As Umbrella (of English. Umbrella ), the bell shape is jellyfish called. The curved surface is called the exumbrella , the concave underside is called the subumbrella . The bell is made up of three acellular and two cellular layers:

• Epithelium of the exumbrella, consists of highly flattened cells with no contractile fibers
• Radial canals made up of proteoglycans , glycoproteins , collagen fibrils and lots of water
• the thinner inner mesogloea.
• Flattened epithelial cells containing striated myofibrils. They perform the rhythmic swimming movement of the bell.