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  • 1970-1974  (2)
  • Interstitial nucleus of Cajal  (1)
  • Spinal Motoneurons  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 20 (1974), S. 223-238 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 348 (1974), S. 211-223 
    ISSN: 1432-2013
    Keywords: Frog-Vestibulospinal System ; Spinal Motoneurons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Field and intracellular potentials were recorded in the lumbar spinal cord of the frog following stimulation of the anterior branch of the vestibular nerve and vestibular nucleus. The field potential recorded in the motoneuron pool after VIIIth nerve stimulation consisted of two presynaptic positive-negative potentials (latencies 1.7 and 2.6 msec) followed by a slow negative wave. The latency of the first presynaptic field potential was only 0.6 msec longer than the presynaptic field potential evoked by stimulation of the vestibular nucleus; it is suggested that electrotonic coupling in the vestibular nuclei is responsible for the fast vestibulospinal transmission. Whereas VIIIth nerve stimulation produced EPSPs in both flexor (peroneal) and extensor (tibial) motoneurons, IPSPs were found only in extensor motoneurons. The functional implication of these findings was discussed. Comparison of PSP latencies with the extracellular presynaptic field potentials generated by VIIIth nerve or nucleus stimulation indicated that EPSPs were produced by the excitatory action of vestibulospinal axons on motoneurons. The longer latencies of the vestibular induced IPSPs suggested that they were generated indirectly by inhibitory spinal interneurons. Preliminary experiments on the interaction of segmental and vestibular induced PSPs suggest that the latter are generated close to the soma of motoneurons.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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