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UCONN - PNB 2264 - Class Notes - Week 9

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UCONN - PNB 2264 - Class Notes - Week 9

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background image Learning Objectives: General Sensation (Ch. 12) The ability to identify a common object by touch alone: ex. of perception Steriaugnosis: the ability to identify an object by touch alone 1. Define sensory transduction   Sensory Transduction CONVERT stimulus energy into  CHANGES in MEMBRANE  POTENTIAL (so the nervous system can understand it) Sensory receptors are able to transduce information from the 
environment
Usually uses MECHANICAL ENERGY START by making a RECEPTOR POTENTIAL (graded potential) in  the dendrites Turns the potential into an A CTION POTENTIAL to move to the  spinal cord  brain  thalamus   primary sensory cortex  spread to  everywhere that is needed to make a conclusion of what the  stimulus is Adequate stimulus The  BEST, most PREFERRED, stimulus of receptors, one that  requires the  LEAST amount of ENERGY to activate receptor  Visual receptors   rods and cones= activated by  light Photoreceptors: One PHOTON is enough to give you a receptor potential from a 
rod  
THE BEST WAY TO ACTIVATE THE RECEPTORS!!! Rubbing eyes hard  spots because we are activating receptors  with MECHANICAL STIMULUS Where are  receptors located? Part of the unipolar neuron (nerve endings/ distal end of the 
dendrites itself)
Receptors can be in  separate cells that release transmitters to  the dendrites at end of the unipolar sensory neuron
background image 2. Classify the various types of sensory receptors 1. By location Exteroceptors  ­afferent nerve endings that sense stimuli originating from outside of  the body (pain, touch, pressure, vibration, temperature, sound) Interoceptors  ­sensory nerve ending located in the cells in viscera that responds to  stimuli originating from within the body with relation to the function of  the internal organs (ex. blood temp.) Proprioceptor ­sensors that provide information about joint angle, muscle length,  and muscle tension, which is integrated to give information about the 
position of the body in space
b. By modality Thermoreceptors  ­detect difference in temperature ­found throughout the skin in order to allow sensory reception 
throughout the body
Mechanoreceptor
­physical interaction, including: pressure and vibration
­all innervated by A  fibers except free nerve endings which are 
β innervated by A  fibers δ Nociceptors  ­ noxious stimuli (pain, discomfort) most are  slowly adapting Photoreceptors  ­cells in the retina that respond to light
­large amounts of tightly packed membrane that contains 
photopigment rhodopsin or a related molecule Chemoreceptors  ­central:located in the medulla, sensitive to pH of their  environment
­peripheral: aortic and carotid bodies, act principally to detect 
variation of oxygen concentration in the arterial blood, also 
monitors arterial carbon dioxide and pH
­molecules dissolved in water or air for taste and smell 3. Define sensory unit and receptive field  Sensory Unit One afferent plus all of its receptors. More are activated by a stronger 

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School: University of Connecticut
Department: Physiology
Course: Human Physiology and Anatomy
Professor: Kristen Kimball
Term: Fall 2018
Tags:
Name: PNB 2264 week 9
Description: These notes cover class power-points and objectives.
Uploaded: 11/09/2018
6 Pages 58 Views 46 Unlocks
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