End of Reflex lecture

End of Reflex lecture - Experiment 2: Vestibular-Ocular...

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Experiment 2: Vestibular-Ocular Reflex Polysynaptic reflex that is a response to angular acceleration and decerleration o We will study this by spinning a volunteer in a chair The sensory structures for this reflex are the semicircular canals in the inner ear o There are three in each ear – one in each X, Y, Z plane that are situated at a 30 degree angle posterior Hair cells o Receptors for the VOR o Located within the ampullae of semicircular canals o Respond to angular acceleration o Embedded in a gelatinous mass called the cupula and project into fluid filling in canals called endolymph o Two types of projection: Kinocilium: longest hair cell positioned toward midline of head Stereocilia: series of shorter projections that are more movable o Each hair cell synapses with a sensory neuron of the Vestibular nerve o If hair moves toward kinocilium K + channel open depolarization Ca 2+ channels open release of excitatory neurotransmitter (glutamate)
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This note was uploaded on 03/15/2010 for the course NPB101L 83009 taught by Professor Liets during the Winter '09 term at UC Davis.

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End of Reflex lecture - Experiment 2: Vestibular-Ocular...

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