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  • 1970-1974  (2)
  • Trochlear nucleus  (1)
  • Vestibular efferents  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Intracellular study of frog's vestibular neurons in relation to the labyrinth and spinal cord (1974)
    Springer
    Experimental brain research 19 (1974), S. 377-393 
    Details
    ISSN: 1432-1106
    Keywords: Frog vestibular neurons ; Dendritic spikes ; Vestibular efferents ; Electrotonic coupling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Field and intracellular potentials were recorded in the vestibular nuclei of the frog following stimulation of the anterior branch of the ipsilateral vestibular nerve and the spinal cord. The field potential induced by stimulation of the vestibular nerve consisted of an early positive-negative wave followed by a slow negativity and that recorded during spinal cord stimulation was composed of an antidromic potential followed by a slow negative wave. These potentials were most prominent in the ventral region of the stato-acoustic complex. Mono- and polysynaptic EPSPs were recorded from vestibular neurons following vestibular nerve stimulation. Short latency depolarizations of small amplitude preceded the monosynaptic EPSPs in some neurons. Spike-like partial responses were commonly superimposed on the EPSPs. These all-or-none depolarizations probably originated in the dendrites. In a group of vestibular neurons stimulation of the vestibular nerve evoked full action potentials with latencies ranging from 0.2 to 1.1 msec. They are presumably caused by antidromic activation of neurons which send their axons to the labyrinth. The presence of efferent neurons in the vestibular nuclei was confirmed by their successful staining with Procion Yellow following axonal electrophoresis. After stimulation of the spinal cord, antidromic spike potentials and EPSPs were recorded in vestibular neurons. In addition, short-latency depolarizing potentials (EDPs) were evoked by spinal stimulation, with latencies similar to those of antidromic potentials. The EDPs are suggested to be induced by electrotonic transmission from the neighboring cell and likely to be active spike potentials produced at some distance away from the soma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234462
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Monosynaptic excitatory and inhibitory pathways from medial midbrain nuclei to trochlear motoneurons (1974)
    Springer
    Experimental brain research 20 (1974), S. 223-238 
    Details
    ISSN: 1432-1106
    Keywords: Trochlear nucleus ; Interstitial nucleus of Cajal ; Darkschewitsch nucleus ; Descending oculomotor control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Stimulation of both an ipsi and contralateral medial midbrain area in pentobarbital anesthetized cats evoked an EPSP-IPSP sequence in trochlear motoneurons (TMn). The latencies of both the EPSP and IPSP were in the monosynaptic range. Experiments on chronic medial longitudinal fasciculus sectioned cats showed that the TMn effects were not produced by collaterals of ascending vestibular axons antidromically excited from the medial midbrain. Stimulation of the same area had no effect in abducens motoneurons, but produced EPSPs and spikes in reticular neurons just ventral to the VI nucleus. The effective area for producing TMn PSPs, as delimited by multiple stimulation electrode arrays, extended only over the interstitial nucleus of Cajal-nucleus of Darkschewitsch area (IN). The effective bilateral IN areas appeared homogeneous in their ability to produce both the EPSP and IPSP components in TMns, even at minimum stimulus strength. It was concluded that the IN area is the origin of monosynaptic excitatory and inhibitory pathways to TN, and it was discussed how the IN has the synaptology required of an integration center for reciprocal control of conjugate vertical and rotational eye movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238314
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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