Efferent Control of Hair Cell and Afferent Responses in the Semicircular Canals
نویسندگان
چکیده
منابع مشابه
Efferent control of hair cell and afferent responses in the semicircular canals.
The sensations of sound and motion generated by the inner ear are controlled by the brain through extensive centripetal innervation originating within the brain stem. In the semicircular canals, brain stem efferent neurons make synaptic contacts with mechanosensory hair cells and with the dendrites of afferent neurons. Here, we examine the relative contributions of efferent action on hair cells...
متن کاملHair-cell versus afferent adaptation in the semicircular canals.
The time course and extent of adaptation in semicircular canal hair cells was compared to adaptation in primary afferent neurons for physiological stimuli in vivo to study the origins of the neural code transmitted to the brain. The oyster toadfish, Opsanus tau, was used as the experimental model. Afferent firing-rate adaptation followed a double-exponential time course in response to step cupu...
متن کاملEfferent Control of Hair Cell and Afferent Responses
40 The sensations of sound and motion generated by the inner ear are controlled by the brain 41 through extensive centripetal innervation originating within the brainstem. In the semicircular 42 canals, brainstem efferent neurons make synaptic contacts with mechano-sensory hair cells and 43 with the dendrites of afferent neurons. Here, we examine the relative contributions of efferent 44 action...
متن کاملMechanical amplification by hair cells in the semicircular canals.
Sensory hair cells are the essential mechanotransducers of the inner ear, responsible not only for the transduction of sound and motion stimuli but also, remarkably, for nanomechanical amplification of sensory stimuli. Here we show that semicircular canal hair cells generate a mechanical nonlinearity in vivo that increases sensitivity to angular motion by amplification at low stimulus strengths...
متن کاملSemicircular Canals Circumvent Brownian Motion Overload of Mechanoreceptor Hair Cells
Vertebrate semicircular canals (SCC) first appeared in the vertebrates (i.e. ancestral fish) over 600 million years ago. In SCC the principal mechanoreceptors are hair cells, which as compared to cochlear hair cells are distinctly longer (70 vs. 7 μm), 10 times more compliant to bending (44 vs. 500 nN/m), and have a 100-fold higher tip displacement threshold (< 10 μm vs. <400 nm). We have devel...
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ژورنال
عنوان ژورنال: Journal of Neurophysiology
سال: 2009
ISSN: 0022-3077,1522-1598
DOI: 10.1152/jn.91367.2008