THOMAS, K. S.; SATTERLIE, R. A.; Arizona State University and Colorado State University; University of North Carolina, Willmington: How Do Jellyfish Turn?: Neuromuscular Considerations

We are continuing an investigation of the muscle architecture of cubomedusae primarily through a thorough biomechanical and neurophysiological study of swim mechanics in these agile jellyfish. Through the immunohistochemical localization of actin, FMRFamide, and α and β-tubulin, we have shown that the subumbrellar nerve net of the jellyfish�s bell is less dense than in the velarium of the jellyfish. Also we have shown that at the frenula, the muscles bend at a 90 degree angle. This shows that the frenula may be important in asymmetrical contractions of the cubomedusae which underlie turning behavior because it is located within the more dense velarium. The velarium is arguably more dense because it is important in directional swimming.