UGA CBIO 2200 - Senses (5 pages)

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General and special senses

Lecture number:
Lecture Note
University of Georgia
Cbio 2200 - Anat & Physiol I

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CBIO 2200 1nd Edition Lecture 22 Outline of Last Lecture I Visceral Reflexes II Functional Organization III The Enteric Nervous System IV Neurotransmitters and Their Receptors Outline of Current Lecture I Sensory Receptors II General Senses III Special Senses Current Lecture Chapter 16 Sense Organs I Sensory Receptors a Properties and types of sensory receptors i Sensory receptor specialized structure for detecting a stimulus 1 Bare nerve endings general senses 2 True sense organs e g eye doesn t do anything except see ii General properties 1 Transduction 2 Receptor potential a Strong receptor potential action potential 3 Sensation created by the action potential 4 Sensory receptors transmit four kinds of information a Modality i Labeled line code theory says all action potentials are identical the pathways are labeled some way These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute so brain can tell where action potentials are coming from ii Tells you which sense perceived stimulus e g whether it was heard or seen b Location i Receptive field the portion of an area usually skin that is innervated by a neuron 1 Some are large and some are very small 2 With large receptive fields it is difficult to tell where stimulus is coming from in that area ii Two point touch discrimination when two pricks in same large receptive field it feels like there was just one prick if two pricks are given at small receptive field you can more accurately feel the two separate pricks the pins will hit two separate receptive fields c Intensity encoded by i Which fibers are sending the signals ii How many fibers are sending the signals iii How fast are these fibers sending the signals d Duration change in firing frequency over time i Sensory adaptation the longer a stimulus is present the firing of the neuron gets slower and slower ii Phasic receptors gives information about smell for example

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