Summary
Vestibulo-ocular reflexes were elicited in isolated preparations of small adult sea lampreys (Petromyzon marinus). Mechanical stimulation of the labyrinths or electrical stimulation of the vestibular nerves produced stereotyped, conjugated eye movements (Table 1) and appropriate electrical activities in individual extraocular muscles (Fig. 1). No inhibition of discharges in motor nerves was observed during stimulation of opposing reflexes. Likewise, nystagmus was never seen during continued stimulation. The primitive eye reflexes of the lamprey probably correspond to the simple excitatory pathways from single ampullae to individual eye muscles of higher vertebrates.
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References
Baker, R.G., Mano, N., Shimazu, H.: Postsynaptic potentials in abducens motoneurons induced by vestibular stimulation. Brain Res.15, 577–580 (1969)
Burlet, H. M. de, Versteegh, C.: Über Bau und Funktion des Petromyzon-Labyrinthes. Acta otolaryng. (Suppl.) (Stockholm)13, 5–58 (1930)
Cohen, B., Suzuki, J.-I., Bender, M. B.: Eye movements from semicircular canal nerve stimulation in the cat. Ann. Otol. Rhinol. Laryng.73, 153–169 (1964)
Korn, H., Bennett, M.V.L.: Vestibular nystagmus and teleost oculomotor neurons: Functions of electrotonic coupling and dendritic impulse initiation. J. Neurophysiol.38, 430–451 (1975)
Löwenstein, O.: The tonic function of the horizontal semicircular canals in fishes. J. exp. Biol.14, 473–482 (1937)
Lowenstein, O.: The electrophysiological study of the responses of the isolated labyrinth of the lamprey (Lampetra fluviatilis) to angular acceleration, tilting, and mechanical vibration. Proc. roy. Soc. B174, 419–434 (1970)
Lowenstein, O., Osborne, M.P., Thornhill, R.A.: The anatomy and ultrastructure of the labyrinth of the lamprey (Lampetra fluviatilis L.). Proc. roy. Soc. B170, 113–134 (1968)
Löwenstein, O., Sand, A.: The individual and integrated activity of the semicircular canals of the elasmobranch labyrinth. J. Physiol. (Lond.)99, 89–101 (1940)
Maxwell, S.S.: Labyrinth and equilibrium. In: Monographs on experimental biology. Philadelphia: Lippincott 1923
Ozawa, S., Precht, W., Shimazu, H.: Crossed effects on central vestibular neurons in the horizontal canal system of the frog. Exp. Brain Res.19, 394–405 (1974)
Precht, W.: Vestibular system. In: MTP International Review of Science, Neurophysiology, series 1, Vol. 3 (ed. C.C. Hunt), pp. 81–149. London: Butterworth 1975
Shimazu, H., Precht, W.: Inhibition of central vestibular neurons from the contralateral labyrinth and its mediating pathway. J. Neurophysiol.29, 467–492 (1966)
Stefanelli, A.: II sistema statico dei Petromizonti (sistema Laterale, sistema Vestibolare, Cervelletto). I: Centri nervosi e vie central!. Arch. Zool. Ital.24, 209–273 (1937)
Stefanelli, A., Caravita, S.: Ultrastructural features of the synaptic complex of the vestibular nuclei ofLampetra planen (Bloch). Z. Zellforsch.108, 282–296 (1970)
Szentagothai, J.: The elementary vestibulo-ocular reflex arc. J. Neurophysiol.13, 391–407 (1950)
Wilson, V.J.: Physiological pathways through the vestibular nuclei. Int. Rev. Neurobiol.15, 27–81 (1972)
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This work was supported by USPHS grants NS 09367 and NS 70391. Adult sea lampreys were most kindly provided by Patrick J. Manion and by E. Louis King, Jr. of the US Bureau of Sport Fisheries. Nigel W. Daw and Leslie P. Rovainen provided helpful comments on the manuscript.
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Rovainen, C.M. Vestibulo-ocular reflexes in the adult sea lamprey. J. Comp. Physiol. 112, 159–164 (1976). https://doi.org/10.1007/BF00606535
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DOI: https://doi.org/10.1007/BF00606535