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3 Δεκ 2020 · Jellyfish are made up of three layers; epidermis, mesoglea, and the gastrodermis. The epidermis forms their outer layer which contains the nerve net. The middle layer is made up of the mesoglea which is a thick, elastic, jelly-like substance.
16 Ιουν 2024 · Lacking brains, blood, or even hearts, jellyfish are pretty simple critters. They are composed of three layers: an outer layer, called the epidermis; a middle layer made of a thick, elastic, jelly-like substance called mesoglea; and an inner layer, called the gastrodermis.
5 Ιουν 2024 · Epidermis: the outermost layer composed of epithelial cells. It protects the jellyfish from the marine environment and contains sensory and receptor cells that detect environmental stimuli such as light and pressure.
The bell-shaped body is composed of an outer layer of skin, called the epidermis, and an inner layer of cells, called the gastrodermis. The tentacles are lined with specialized cells called cnidocytes, which contain stinging cells called nematocysts.
Similar to sponges, cnidarians are diploblasts, meaning that they develop from two basic germ (cell) layers: an ectoderm, or outer layer, and an endoderm, or inner layer. Between the ectoderm, which contains the cnidocysts, and the endoderm there is a non-cellular substance called the mesoglea.
The body of an adult jellyfish consists of a bell shaped hood enclosing its internal structure and from which tentacles are suspended. Each tentacle is covered with cells called ‘cnidocytes’ (a type of venomous cell unique to the phylum ‘Cnidaria’), that can sting or kill other animals.
The gastrodermis lines the all-purpose gut and an opening where food enters and reproductive cells are released and taken in. Jellies have no need for a stomach, intestine, or lungs: nutrients and oxygen slip in and out of their cell walls through the gastrodermis or even their bodies' outer cells.
