Summary
Comparative ultrastructural analyses of the muscles that work the lantern of Aristotle support the opinion that the muscles in question are myoepithelially organized or derivatives of myoepithelia. They are part of the epithelium of the peripharyngeal cavity (=lantern coelom). The coelom epithelium may become multiplelayered in certain regions and is composed of (1) a layer of muscle cells that vary in number and size, (2) nerve cells and their processes that are interspersed between the muscle layer and (3) monociliated adluminal cells that build a continuous cell lining and completely cover the muscle layer. According to their complexity, the lantern muscles exhibit consecutive stages of myoepithelial variations and may finally simulate subepithelial musculature. The results of this study support the hypothesis of a histological development of subepithelial musculature from simple myoepithelia, although both epithelial and mesenchymal musculature may occur in the Echinodermata. Detailed knowledge of the organization of the lantern's coelom space was a prerequisite for the present study. In contrast to previous examinations the lantern coelom is not a continuous space, but is subdivided into several cavities that are partially completely separated from each other. On the one hand, this subdivision is probably caused by the sophisticated arrangement of the lantern's ossicles and on the other by the septa that give rise to muscles that fulfill different functions. lanter's ossicles and on the other by the septa that give
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Stauber, M. The lantern of Aristotle: organization of its coelom and origin of its muscles (Echinodermata, Echinoida). Zoomorphology 113, 137–151 (1993). https://doi.org/10.1007/BF00403091
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DOI: https://doi.org/10.1007/BF00403091