Abstract
Mechanosensory hair cells release chemical transmitter onto associated afferent dendrites and respond to transmitters released by efferent neurons. Dihydropyridine-sensitive, voltage-gated calcium channels support transmitter release from hair cells and may be expressed preferentially at release sites. Recently, a novel subunit of the nicotinic acetylcholine receptor family, α9, was identified and found to be expressed in rat hair cells. It appears to mediate efferent inhibition via associated calcium-activated potassium channels.
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