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Cell and Tissue Research

, Volume 329, Issue 1, pp 147–157 | Cite as

The ring nerve of the box jellyfish Tripedalia cystophora

  • A. Garm
  • Y. Poussart
  • L. Parkefelt
  • P. Ekström
  • D-E. Nilsson
Regular Article

Abstract

Box jellyfish have the most elaborate sensory system and behavioural repertoire of all cnidarians. Sensory input largely comes from 24 eyes situated on four club-shaped sensory structures, the rhopalia, and behaviour includes obstacle avoidance, light shaft attractance and mating. To process the sensory input and convert it into the appropriate behaviour, the box jellyfish have a central nervous system (CNS) but this is still poorly understood. The CNS has two major components: the rhopalial nervous system and the ring nerve. The rhopalial nervous system is situated within the rhopalia in close connection with the eyes, whereas the ring nerve encircles the bell. We describe the morphology of the ring nerve of the box jellyfish Tripedalia cystophora as ascertained by normal histological techniques, immunohistochemistry and transmission electron microscopy. By light microscopy, we have estimated the number of cells in the ring nerve by counting their nuclei. In cross sections at the ultrastructural level, the ring nerve appears to have three types of neurites: (1) small “normal”-looking neurites, (2) medium-sized neurites almost completely filled by electron-lucent vacuoles and (3) giant neurites. In general, only one giant neurite is seen on each section; this type displays the most synapses. Epithelial cells divide the ring nerve into compartments, each having a tendency to contain neurites of similar morphology. The number and arrangement of the compartments vary along the length of the ring nerve.

Keywords

Central nervous system Ring nerve Neurite morphology Histology Immunohistochemistry Transmission electron microscopy Cubozoa Box jellyfish, Tripedalia cystophora (Cnidaria) 

Notes

Acknowledgements

The authors appreciate the skilled laboratory work performed by Rita Wallén and Carina Rasmussen. They also thank the staff, especially Wilson Rovira, at the marine station of Isla Magueyes for all their help.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • A. Garm
    • 1
  • Y. Poussart
    • 2
  • L. Parkefelt
    • 1
  • P. Ekström
    • 1
  • D-E. Nilsson
    • 1
  1. 1.Department of Cell and Organism BiologyLund UniversityLundSweden
  2. 2.Département de BiologieUniversité de MonctonMonctonCanada

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