Student Project Figures Figure 8 Primary muscle fields of an anemone, defined by major axis and direction of contraction. Longitudinal muscle fields (1) include retractor muscles on the mesenteries and ectodermal muscles of the tentacles which run the length of the column and through the tentacles. Radial muscle fields (2) include endodermal basilar muscles, transverse muscles of the mesenteries and ectodermal muscles of the oral disc. Circular muscle fields (3) include endodermal/mesogleal marginal sphincter muscles & endodermal muscles of column and tentacles. Oblique muscle fields (4) comprise of parietobasilar muscles of the mesenteries. Adapted from Shick (1991). Figure 8