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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 ?
In addition, the unique arrangement of longitudinal muscle within the mesoglea may provide morphological support for the hypothesis that Cnidaria represent an evolutionary link to the bilaterian lineage (Seipel and Schmid, 2005,2006; Burton, 2008; Steinmetz et al., 2012).
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.g., Gosline, 1971; Chapman, 1974; Koehl, 1977; Tillet-Barret et al., 1992).
By inserting a carmine-soaked splinter into the mesoglea of a scyphozoan and describing the resultant accumulation of amoebocytes around this large foreign body that phagocytized the carmine, Metchnikoff pioneered the field of cellular immunology.
We previously identified cells with the morphology of neurons in the mesoglea of the pharynx and retractor muscle; at least one cell in the mesoglea of the retractor muscle was positive for expression of [alpha]238305 (Fig.
contain scaphoids that are predominantly on the branch surface; spindles and octoradiates found in the mesoglea; and rods that are found as an "armor" on the polyp surface.
At this stage, the body of the larvae consisted of two germ layers (ectoderm and endoderm) that were separated by the mesoglea. Ectodermal cells were columnar and stained weakly with toluidine blue, while endodermal cells were irregularly shaped and highly vacuolated due to lipid storage (Fig.
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., 2006).
1b) distributed throughout the body, mainly within the mesoglea. The colonies used in this study were collected at 5-8 m depth in the Gulf of Aqaba, Jordan, and had been maintained in the aquarium of the Oceanographic Museum of Monaco for at least 3 years prior to this study.
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).