Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons.

Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons. Research Abstract Details 

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Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons. Abstract Text:

X Zhang,M Zakir,H Meng,H Sato,Y Uchino,

We studied the convergence of two afferent pairs of single vestibular neurons by selective stimulation of the horizontal semicircular canal (HC) and saccular (SAC) nerves, and the HC and utricular (UT) nerves in decerebrate cats. All recorded neurons were classified as vestibulospinal (VS), vestibulo-oculospinal (VOS) or vestibulo-ocular (VO), by antidromic stimulation from the oculomotor/trochlear nuclei and the spinal cord: neurons that could not be activated from any test sites were classified as vestibular (V) neurons. Of a total of 125 neurons activated by stimulation of the HC/SAC nerves, 21(17%) received convergent inputs. Twelve of 21 neurons received monosynaptic excitatory inputs from both nerves. About half (9/21, 43%) of the convergent neurons were classified as VS neurons, the majority of which descended through the ipsilateral lateral vestibulospinal tract (i-LVST). The HC/SAC convergent neurons were located in the rostral part of the descending, the medial and the caudal-ventral part of the lateral vestibular nucleus. In 80 neurons studied by stimulation of the HC/UT nerves, both inputs converged in 12 (15%) neurons, more than half of which were VS neurons. Eight of 12 convergent neurons received excitatory inputs followed by inhibition from both the HC and UT nerves. A few convergent neurons (3/12) projected to the oculomotor/trochlear nucleus. Half of the convergent and non-convergent VS neurons descended to the spinal cord through the i-LVST, and the only one VOS convergent neuron via the medial vestibulospinal tract. Most of the convergent neurons were located in the lateral, the rostral part of the descending and medial vestibular nucleus. The percentages of HC/SAC and HC/UT convergence were half those of the posterior semicircular canal (PC), PC/SAC (33%) and PC/UT (33%) convergence, respectively. The convergent neurons receiving the HC and otolith inputs may contribute at least partly to the vestibulocollic reflex.

Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons. Publishing Authors By Initials

X Zhang,M Zakir,H Meng,H Sato,Y Uchino,

For similar nervous system: central nervous system: brain: brain stem: rhombencephalon: metencephalon: pons: vestibular nuclei research abstracts see: nervous system: central nervous system: brain: brain stem: rhombencephalon: metencephalon: pons: vestibular nuclei research

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Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 140

Page Numbers: 1-11

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ISSN: 0014-4819

DAY: 15

MONTH: Sep

YEAR: 2001

Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons. Keywords Mesh Terms:

KEYWORDS: Vestibular Nuclei

MESH TERMS: physiology

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Grant and Affiliation Information for Convergence of the horizontal semicircular canal and otolith afferents on cat single vestibular neurons.

AFFILIATION: Department of Physiology, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo 160-8402. Japan. xialing@tokyo-med.ac.jp

Country: Germany

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MEDLINETA: Exp Brain Res

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