Nerves in the endodermal canals of hydromedusae and their role in swimming inhibition

George O Mackie, Robert W Meech

Research output: Contribution to journalArticle (Academic Journal)

9 Citations (Scopus)

Abstract

N eoturris breviconis (Anthomedusae) has a nerve plexus in the walls of its endodermal canals. The plexus is distinct from the ectodermal nerve plexuses supplying the radial and circular muscles in the ectoderm and no connections have been observed between them. Stimulation of the endodermal plexus evokes electrical events recorded extracellularly as "E" potentials. These propagate through all areas where the plexus has been shown by immunohistology to exist and nowhere else. When Neoturris is ingesting food, trains of "E" potentials propagate down the radial canals to the margin and cause inhibition of swimming. This response is distinct from the inhibition of swimming associated with contractions of the radial muscles but both may play a part in feeding and involve chemoreceptors. Preliminary observations suggest that the "E" system occurs in other medusae including Aglantha digitale (Trachymedusae) where the conduction pathway was previously thought to be an excitable epithelium.

Original languageEnglish
Pages (from-to)199-209
Number of pages11
JournalInvertebrate neuroscience : IN
Volume8
Issue number4
DOIs
Publication statusPublished - Dec 2008

Keywords

  • Animals
  • Electrophysiology
  • Endoderm
  • Immunohistochemistry
  • Microscopy, Electron, Transmission
  • Muscles
  • Nervous System Physiological Phenomena
  • Scyphozoa
  • Swimming

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