The gastrodermis is the inner layer of cells that lines a gastrovascular cavity. A cell is a single unit or compartment, enclosed by a border or wall. ... Gastrovascular cavity, as the name indicates, functions in both digestion and the transport of nutrients to all parts of an animal body. ...
Cilia, nematocyst, gastrodermis, mesoglea and ectodermis all form the coral polyp.
The body wall of a polyp is composed of two layers, the ectodermis on the outside and the gastrodermis on the inside.
The gastrodermis is the layer that houses the zooxanthellae, the single celled algae which exist within the gastrodermal cells themselves and are necessary to the growth of most corals.
The epidermis is usually ciliated in polyps so that the net effect of the ciliary beat is to move material away from the mouth toward the margin of the oral disk and toward the tips of the tentacles.
The mesogleal system is represented by a layer between epidermis and gastrodermis which varies from the thin structureless cementing layer of hydrozoan polyps to the highly complex cellular, fibrous, gelatinous matrix of the scyphomedusans and anthozoans.
In scyphozoans and anthozoans, although glandular cells are common throughout the gastrodermis, they tend to be most abundant along the free edges of the mesenteries of anthozoans and on the gastric tentacles of scyphozoans.
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