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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 ?
Cells in close proximity to the mesogleal layer typically become more compact and contain abundant vesicles along with other dense granules (Fig.
The mesogleal layer is defined with a distinct inner and outer border and contains multiple muscle cells arranged in fascicles (Figs.
Oogenesis: Stage I oocytes were small, ovoid or rounded and the main characteristic was the presence of a thin, bluish-transparent mesogleal layer surrounding the egg (Fig.
An electron microscopic and autoradiographic study of mesogleal organization and collagen synthesis in the sea anemone Aiptasia diaphana.
In cryosections, quinones and quinoproteins stained blue in the outermost ectodermal epithelium cells and in oblong cells with large granules in the mesogleal cell cords (Fig.
2C) were localized mainly in the granular cell layer immediately below the ectodermal epithelium, with some cells in the mesogleal cell cords also staining positive (Fig.
Transport of symbiotic zooxanthellae in mesogleal canals of Zoanthus robustus?
There was no evidence of any sym32 label within the mesogleal layer, and the pattern of distribution of the sym32-containing vesicles in the epidermal cells was distinct from that in the gastrodermis.
The Sigma Scan program was also used to determine the percentage of each labeled section that was epithelial tissue or mesogleal tissue.
The other site of abundant immunoreactivity was the mesogleal nerve net, a meshwork of neurons and amoebocytes embedded in the collagen-based jelly, the meso-glea, that separates ectoderm from endoderm [ILLUSTRATION FOR FIGURE 6D OMITTED].
Research into the true biological roles and phylogenetic status of the mesogleal amoebocytes is hampered by the small, and often variable, number of the cells in anthozoans and the difficulty of their isolation for in vitro analysis (Patterson and Landolt, 1974; Van der Vyver, 1981).