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(invertebrate zoology)
The gelatinous layer between the ectoderm and endoderm in cnidarians and certain sponges.



a structureless gelatinous substance in lower multicellular diploblastic animals (sponges and coelenterates) that is released by the ectoderm and endoderm and fills the space between the two. In jellyfish and ctenophorans, the mesoglea is thoroughly saturated with water (about 97.5 percent). The mesoglea of sponges contains amoeboid and germ cells, cells that form skeletal elements, and other cells that impart to it the quality of loose parenchyma.

References in periodicals archive ?
Elemento esqueletico calcareo poliforme que se encuentra en la mesoglea y tambien en el eje de Scleraxonia.
Masson's trichrome (Sumner & Sumner, 1969) was suggested by Manuel (1981) as a general stain for Anthozoa, allowing for a good contrast between the mesoglea and the cellular regions.
Among cnidarians, the ECM has a variety of functions, but it mainly provides support for tissues, and it is the principal visible structure in the acellular mesoglea (e.
The gastroderm tissues of the mesenteries and the solenia are separated from the surrounding mesoglea by collagen-rich basal lamina (Menzel et al.
Similarly, in some cnidarians, including gorgonians, scleractinian corals, and sea anemones, amoebocytes are recruited from the mesoglea to the wound site, and these cells engage in phagocytosis (Hutton and Smith, 1996; Meszaros and Bigger, 1999; Olano and Bigger, 2000; Henry and Hart, 2005; Mydlarz et al.
At the interradii, the tissue sheets are connected to the bell mesoglea, but the circular, striated muscle sheets are continuous, showing no interruptions (Fig.
Like the cnidae that they support, the epithelial cells in anemones are unusually tall and thin, secreting and supported by an unusually fibrous and structured mesoglea which almost qualifies as connective tissue (Hyman, 1940; Chapman, 1966; Gosline, 1971; Koehl, 1977).
Larger anemones also have thicker mesoglea (Shick, 1991; Francis, 2004), which can support a thicker attached layer of tissue and larger nematocysts (i.
In both symbiotic and aposymbiotic tentacles, preimmune controls showed light brown staining in epidermal and gastrodermal tissues, and no staining in the mesoglea.
Their soft body makes it easy to separate ectodermal epithelium from associated mesoglea to further localize enzyme activity to specific tissues.
A more serious problem is that these bubbles will slowly work themselves through the mesoglea, which can lead to infection.