01:119:116 Lecture Notes - Lecture 20: Taste, Cochlea, Ossicles
23 Apr 2016
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Document Summary
Individual gains information from external environment and internal bodily state. Appropriate motor response is carried out by body. Detection of stimulus by sensory receptor structures that detect information about changes in the internal or external environment. Neuronal afferent neuron whose axon extends directly into. Non-neuronal form chemical synapse with afferent neurons. Convert e of stimulus into electrical e = sensory transduction. = change in membrane potential of receptor. Caused by flow of ions across membrane of sensory receptor. Transduction can be modified in two ways. Decrease in frequency of ap in sensory neuron. Ap transmitted to the cns = sensory info travels as nerve impulses. Unstimulated maintains resting potential no transmission. Stimulated depolarisation become more positive na+ goes from outside to inside receptor potential reaches threshold triggers ap in associated sensory neuron. The larger the receptor potential, the more frequent the ap. Brain processes information that reaches it via sensory neurons.
