PMID: 6536900Oct 1, 1984Paper

Axon collaterals of anterior semicircular canal-activated vestibular neurons and their coactivation of extraocular and neck motoneurons in the cat

Neuroscience Research
Y Uchino, N Hirai

Abstract

We studied the ascending and descending axonal trajectories of excitatory vestibular neurons related to the anterior semicircular canal, by means of local stimulation and spike-triggered signal averaging techniques in anesthetized cats. More than 200 vestibular neurons related to the ampullary nerve of the anterior semicircular canal (ACN) were identified as vestibulo-ocular neurons by antidromic stimulation of the contralateral inferior oblique (IO) muscle motoneuron pool. In the descending, medial and ventral lateral nuclei, about 60% of these vestibulo-ocular neurons were also activated antidromically by upper cervical spinal cord stimulation (vestibulo-ocular-collic (cervical) = VOC). These VOC neurons produced unitary EPSPs in the majority of neck extensor motoneurons located at the C1 segment. None of the VOC neurons had axons descending as far as the thoracic level. Most of these VOC neurons were activated monosynaptically following stimulation of the ACN. The conduction velocity of the descending axons of VOC neurons was approximately 63 m/s, which was significantly faster than that of the ascending axons. The remaining 40% of the vestibulo-ocular neurons were not activated antidromically following spinal cord stimulati...Continue Reading

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Citations

Jul 2, 2005·Experimental Brain Research·Y UchinoE Kawamoto
May 22, 1992·Annals of the New York Academy of Sciences·J A Büttner-Ennever
Jun 19, 1996·Annals of the New York Academy of Sciences·R BoyleR A McCrea
Jan 1, 1988·Annals of the New York Academy of Sciences·W Graf
Jan 1, 1988·Annals of the New York Academy of Sciences·P P VidalA Berthoz
Jul 8, 1990·The Journal of Comparative Neurology·G Pétursdóttir
Oct 1, 1990·Journal of Neurobiology·W Graf, R Baker
Nov 17, 2001·Annals of the New York Academy of Sciences·R Boyle
Feb 8, 1992·The Journal of Comparative Neurology·Y ShinodaT Futami

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