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Journal of comparative physiology

, Volume 114, Issue 1, pp 51–67 | Cite as

Number and location of the sites of impulse generation in the lateral-line afferents ofXenopus laevis

  • A. Pabst
Article

Summary

  1. 1.

    Every afferent fibre of the lateral line divides into 2 collaterals upon reaching the stitch (neuromast group). Each collateral innervates a part of the stitch, and sends branches to each individual neuromast (Fig. 3) in its region.

     
  2. 2.

    In the area of a stitch the nodes of RANVIER of the afferent and efferent fibres only occur at the branching points. The myelin ends at the basement membrane of the neuromasts (Fig. 5).

     
  3. 3.

    Simultaneous extracellular recordings of afferent activity in two neuromasts show that each neuromast has one impulse generation site. This is situated distal to the myelinated region of the fibre (Figs. 7, 9–11).

     
  4. 4.

    In any one stitch the afferent impulses generated by a single neuromast propagate orthodromically and antidromically within the collaterals and branches of the fibre.

     

Keywords

Basement Membrane Lateral Line Afferent Fibre Afferent Activity Extracellular Recording 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Adrian, E.D., Zotterman, Y.: The impulses produced by sensory-nerve-endings. Part 2. The response of a single end-organ. J. Physiol. (Lond.)61, 151–171 (1926)Google Scholar
  2. Burkhardt, D.: Die Übertragereigenschaften elektrophysiologischer Versuchsanordnungen. Z. Biol.109, 297–324 (1957)Google Scholar
  3. Dijkgraaf, S.: The funktioning and significance of the lateral-line organs. Biol. Rev.38, 51–105 (1963)Google Scholar
  4. Eagles, J.P., Purple, R.L.: Afferent fibres with multiple encoding sites. Brain Res.77, 187–193 (1974)Google Scholar
  5. Edwards, C., Ottoson, D.: The site of impulse initiation in a nerve cell of a crustacean stretch receptor. J. Physiol. (Lond.)143, 138–148 (1958)Google Scholar
  6. Eyzaguirre, C., Kuffler, S.W.: Processes of excitation in the dendrites and in the soma of single isolated sensory nerve cells of the lobster and crayfish. J. gen. Physiol.39, 87–119 (1955)Google Scholar
  7. Flock, A.: Ultrastructure and function in the lateral line organs. In: Lateral line detectors (ed. P. Cahn). Bloomington: Indiana Univ. Press 1967Google Scholar
  8. Florey, E., Florey, E.: Microanatomy of the abdominal stretch receptors of the crayfish (Astacus fluviatilis L.). J. gen. Physiol.39, 69–85 (1955)Google Scholar
  9. Floyd, K., Morrison, J.F.B.: Interactions between afferent impulses within a peripheral receptive field. J. Physiol. (Lond.)238, 62 P (1974)Google Scholar
  10. Gesteland, R.C., Howland, B., Lettvin, I.Y., Pitts, W.H.: Comments on microelectrodes. Proc. IRE.47, 1856–1862 (1959)Google Scholar
  11. Görner, P.: Beitrag zum Bau und zur Arbeitsweise des Seitenlinienorgans vonXenopus laevis. Verh. dtsch. zool. Ges. Saarbrücken, 193–198 (1961)Google Scholar
  12. Görner, P.: Untersuchungen zur Morphologie und Elektrophysiologie des Seitenlinienorgans vom Krallenfrosch (Xenopus laevis Daudin). Z. vergl. Physiol.47, 316–338 (1963)Google Scholar
  13. Görner, P.: Independence of afferent activity from efferent activity in the lateral line organ ofXenopus laevis Daudin. In: Lateral line detectors (ed. P.H. Cahn). Bloomington: Indiana Univ. Press 1967Google Scholar
  14. Harris, G., Flock, A.: Spontaneous and evoked activity from theXenopus laevis lateral line. In: Lateral line detectors (ed. P.H. Cahn). Bloomington: Indiana Univ. Press 1967Google Scholar
  15. Harris, G., Frishkopf, L., Flock, A.: Receptor potentials from hair cells of the lateral line. Science167, 76–79 (1970)Google Scholar
  16. Harris, G., Milne, D.C.: Input-output characteristics of the lateral-line sense organ. J. acoust. Soc. Amer.40, 32–42 (1966)Google Scholar
  17. Horch, K.W., Whitehorn, D., Burgess, P.R.: Impulse generation in type I cutaneous mechanoreceptors. J. Neurophysiol.37, 267–281 (1974)Google Scholar
  18. Kennedy, D.: Input and output connections of single arthropod neurons. In: Physiological and biochemical aspects of nervous integration (ed. F.D. Carlson), pp. 285–306. Englewood Chuffs: Prentice Hall 1968Google Scholar
  19. Lindblom, U.: Excitability and functional organization within a peripheral tactile unit. Acta physiol. scand., Suppl.153, 44, 1–84 (1958)Google Scholar
  20. Lindblom, U., Tapper, D.N.: Integration of impulse activity in a peripheral sensory unit. Exp. Neurol.15, 63–69 (1966)Google Scholar
  21. Macdonald, J.A., Brodwick, M.S.: Inhibition in branched afferent neurons of the bullfrog tongue. J. comp. Physiol.87, 293–316 (1973)Google Scholar
  22. Murray, M.J.: Conductile trees: Obtaining structural and functional information from endpoint measurements. J. theor. Biol.43, 113–132 (1974)Google Scholar
  23. Murray, M.J., Capranica, R.R.: Spike generation in the lateral-line afferents ofXenopus laevis: Evidence favoring multiple sites of initiation. J. comp. Physiol.87, 1–20 (1973)Google Scholar
  24. Murray, R.W.: The lateral-line organs and their innervation inXenopus laevis. Quart. J. micr. Sci.96, 351–361 (1955)Google Scholar
  25. Murray, R.W.: The thermal sensitivity of the lateralis organs ofXenopus. J. exp. Biol.33, 798–805 (1956)Google Scholar
  26. Pabst, A.: A simple method for use with tungsten microelectrodes for the localization of recording sites. Pflügers Arch.339, 355–358 (1973)Google Scholar
  27. Pabst, H., Kennedy, D.: Cutaneous mechanoreceptors influencing motor output in the crayfish abdomen. Z. vergl. Physiol.57, 190–208 (1967)Google Scholar
  28. Palade, G.: A study of fixation for electron microscopy. J. exp. Med.95, 285–298 (1952)Google Scholar
  29. Romeis, B.: Mikroskopische Technik. 16. Aufl. München-Wien: R. Oldenbourg 1968Google Scholar
  30. Russell, I.: The role of the lateral-line efferent system inXenopus laevis. J. exp. Biol.54, 621–641 (1971)Google Scholar
  31. Schmidt, R.: Amphibian acoustico-lateralis efferents. J. cell. comp. Physiol.65, 155–162 (1965)Google Scholar

Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • A. Pabst
    • 1
  1. 1.Institut für Tierphysiologie und Angewandte Zoologie der Freien Universität BerlinBerlin 41

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