BIOL 1412 Lecture Notes - Saccule, Auditory Cortex, Occipital Lobe
4 May 2014
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13. 2: stim. causes opening of gated channels (usually) na+) on receptor membrane, gp on receptor membrane (stim. becomes electrical) If: a) receptor = dendrite of unipolar cell & gp (depol. ) directly generates an ap = a generator potential (fig. 11. 9) (but also called a receptor potential as it is a receptor) b) receptor = ind. cell eg. hair cell = receptor potential nt into associated neuron generator potential on neuron generates an ap. In the presence of a constant stim. show adaptation (usually in sensitivity) Eg. 1: put a hat on burst of aps (feel it) then get in ap even though stim. maintained at constant strength. Eg. 2: hat off - burst of aps - feel it again: tonic receptors. Frequency of aps remain constant - no adaptation. Give con"t-ous info. eg. posture, pain protective. How does brain perceive diff. types of stim. Axon activated by receptor stimulated connections to part of cns concerned to brain (fig.
