Cross sections of tentacles confirmed that the gastrodermis is separated from the epidermis by a collagenous mesogleal
layer containing numerous longitudinal muscle cells arranged in fascicles.
Certain muscles such as the sphincter not only vary in shape and degree of development, but also in the tissue derivation (endodermal or mesogleal
), which, until today, has been particularly useful to define families.
Three stages for oogenesis were defined using the following characteristics: l) presence of single mesogleal
layer surrounding the egg; 2) presence and thickness of basal membrane surrounding the egg; 3) presence of cytoplasmatic material inside the egg (scarce or abundant cytoplasmatic material); 4) presence of vesicular cytoplasmatic inclusions (few or high--giving the egg a bubbly appearance); 5) maximum length of eggs using an ocular micrometer (Olympus, OSM-4, 10 X).
The gelatinous mesogleal
ECM of jellyfish (class Scyphozoa) exhibits a three-dimensional network of thin collagen fibrils (Gambini et al., 2012).
exserta is loosely organized into a richly cellular mesoglea, in which the mesogleal
fibers stain intensely blue, indicating their collagenous nature; a very thin external ectoderm; and a layer of gastroderm that is only a single columnar cell layer thick.
extracellular matrix has been shown to play a role in maintaining the shape of polyps and medusae (Chapman, 1953), and it may therefore have the same function in the cell mass of the podocysts.
The digestive organs of the alcyonaria and their relation to the mesogleal
layer of both aposymbiotic and symbiotic tentacles remained unstained.
1): (1) bell margin tissue--a concentric ring about 1 cm in width, running around the perimeter of the bell; (2) oral arm tissue--the outpocketings of the gastrovascular cavity and overlying tissue layers that extend up into the water column; (3) the epithelial layer from the oral (subumbrellar) and aboral (exumbrellar) regions of the bell; (4) isolated mesogleal
tissue; and (5) samples of intact bell tissue along a radial transect extending from the bell margin to the manubrium (the gastrovascular cavity located at the center of the bell).
Manubrium fleshy, rigid; rectangular, pyramidal, or rounded in side view; variably ruffled at 4 corners; width approximately 1/3 of bell diameter; with stiffened, whorled, perradial mesogleal
A 50-[[micro]liter] sample of mesogleal
fluid was pulled into a hematocrit tube and then expelled into a small Nalgene vial containing 200 [[micro]liter] of Ultrapure concentrated nitric acid.
Specific Cx43 immunoreactivity was widespread but more abundant in the endoderm [ILLUSTRATION FOR FIGURE 6A-C OMITTED] and in the mesogleal
nerve-net [ILLUSTRATION FOR FIGURE 6D OMITTED] than in the ectoderm.