ISSN:
1432-1106
Keywords:
Ampullary nerve
;
Cat
;
EPSP
;
IPSP
;
Vestibular neuron
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary The six ampullary nerves in both labyrinths were separately stimulated by electric pulses in anesthetized cats. Resulting responses in neurons in the vestibular nuclei were recorded intracellularly. Almost all the vestibular neurons showed an EPSP in response to stimulation of the ipsilateral ampullary nerve. These neurons were subclassified as A-, L-, and P-neuron receiving specific projections from the anterior, lateral and posterior canal, respectively. Three fourths of the vestibular neurons recorded from received an IPSP in response to stimulation of the contralateral ampullary nerve. Plane-specific contralateral inhibition was found in most of vestibular neurons; i.e. A-, L-, and P-neuron received IPSP from the contralateral posterior, lateral, and anterior ampullary nerve, respectively. Approximately two thirds of vestibular neurons exhibiting the plane-specific inhibition were recorded in the medial vestibular nucleus. A collision test of impulses in primary afferent fibers were performed during recording of ipsilateral EPSPs produced by strong stimulation of more than one ampullary nerve. No positive evidence was provided for the existence of neural convergence on single vestibular neurons from different ampullary nerves on the same side. It is suggested that the plane-specific contralateral inhibition increase the sensitivity of vestibular neurons during head rotation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00238318
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