We examined whether the enteric nervous system (ENS) is capable of controlling autonomous peristalsis, which occurs in the crop of Aplysia as well as in the esophagus of Lymnaea. Interestingly, “pacemaker neurons”, which lead peristaltic rhythm, were found in the gizzard in Aplysia and in the crop in Lymnaea; both of these structures are located distal to the regions exhibiting peristalsis. Thus, the bursting activity of the ENS first occurred in lower regions and then progressed in an ascending direction (i.e. in the opposite direction of peristalsis). The two species are thought to differ in terms of the mechanisms involved in producing peristalsis.
Bortoff, A. (1961) Slow potential variations of small intestine. Am. J. Physiol. 201, 203–208.
Cropper, E. C., Evans, C. G., Hurwits, I., Jing, J., Proekt, A., Romero, A., Rosen, S. C. (2004) Feeding neural networks in the mollusc Aplysia. Neurosignals 13, 70–86.
Howells, H. H. (1942) The structure and function of the alimentary cannal of Aplysia punctata. Q. J. Microsc. Sci. 83, 357–397.
Ito, S., Kurokawa, M. (2007) Coordinated peripheral neuronal activities among the different regions of the digestive tract in Aplysia. Zool. Sci. 24, 714–722.
Kurokawa, M., Ito, S., Okamoto, T. (2008) Activities and functions of peripheral neurons in the enteric nervous system of Aplysia and Lymnaea. Acta Biol. Hung. 59, 65–71.
Okamoto, T., Kurokawa, M. (2010) The role of the peripheral enteric nervous system in the control of the gut motility in the snail Lymnaea stagnalis. Zool. Sci. 27, 602–610.
Presented during the 12th ISIN Symposium on Invertebrate Neurobiology, August 31–September 4, 2011, Tihany, Hungary.
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Kurokawa, M., Kasuya, Y. & Okamoto, T. Origin of Automaticity and Neural Regulation of Peristalsis in the Gastrointestinal Tract of Aplysia and Lymnaea?. BIOLOGIA FUTURA 63, 202–205 (2012). https://doi.org/10.1556/ABiol.63.2012.Suppl.2.26
- Enteric nervous system
- gastrointestinal tract