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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 · 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. An elementary nervous system, or nerve net, allows jellyfish to smell, detect light, and respond to other stimuli.
5 Ιουν 2024 · The umbrella consists of several layers: 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. Mesoglea: the intermediate gelatinous layer that makes up most of the umbrella's volume ...
The body has two tissue layers—an outer ectoderm, or epidermis, and an inner endoderm, or gastrodermis. Sandwiched between these layers is the jellylike mesoglea, which provides bulk and support for the animal.
6 Ιαν 2021 · (A) The exumbrellar surface of the mesoglea is covered with a three-layered sheet, which includes the outer, middle (ml), and basal layers (bl). (B) Enlargement of the outer layer overlying the middle layer. Facing arrowheads indicate the outer layer. bl, basal layer; me, mesoglea; ml, middle layer. Scale bars: 0.5 µm for (A), 0.2 µm for (B).
Jellyfish are found all over the world, from surface waters to the deep sea. Scyphozoans (the "true jellyfish") are exclusively marine, but some hydrozoans with a similar appearance live in fresh water. Large, often colorful, jellyfish are common in coastal zones worldwide.
The outer layer (from ectoderm) is called the epidermis and lines the outside of the animal, whereas the inner layer (from endoderm) is called the gastrodermis and lines the digestive cavity. In the planula larva, a layer of ectoderm surrounds a solid mass of endoderm, but as the polyp develops, the digestive or gastrovascular cavity opens ...
