Vestibular Efferent Activity in Squirrel Monkeys
WASHINGTON UNIV ST LOUIS MO
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All vertebrates are endowed with a vestibular efferent system EVS consisting of somata within the Central Nervous System with long axons exiting the brain to innervate the labyrinth. Behaviorally relevant stimuli related to feeding andor aggressive behaviors and conditions leading to enhanced attentional states or alerting, activate the EVS. Increased EVS activity modifies the resting rate and response dynamics to motion of vestibular afferents. This modification is non-uniform across the fiber spectrum of the semicircular canals, for example, affecting the more sensitive, low spontaneous activity cells more profoundly than their less sensitive counterparts. The cellular bases for EVS effects are excitatory axo-axonic synapses upon primary afferents and axo-somatic inhibitory synapses upon hair cells.
- Medicine and Medical Research