phystut4 - Somatosensory System Specialized receptors can...

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2/28/10 Somatosensory System Specialized receptors can transduce various
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2/28/10 Basic Principles of Sensation What division of the PNS tells us about changes in the internal (within our body) and external (everything else) environment? The AFFERENT Division What is the physiological term for the types of energies that our body can detect? Sensory Modalities Specialzied Receptors are the body’s “tool” that transduce the various sensory modalities that we can detect into action potentials, which are then sent to the CNS.
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2/28/10 Basic Principles of Sensation This figure illustrates the basic pathway of sensory information within the human body. What is the primary “component” within this pathway? SENSORY RECEPTORS
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2/28/10 Sensory Receptors Sensory Receptors: Are specialized receptors that have evolved in such away that allows them respond to a specific external or internal stimuli. There are many different types of sensory receptors within the human body. Give examples of 3 external stimuli that specialized sensory receptors can detect? Chemicals Heat Light
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2/28/10 Sensory Receptors Again, Sometimes specialized receptors can respond weakly when activated by a different stimulus. The physiological term to describe Cross-talk Apparently, hitting your head really hard and hearing the “ringing” in your ears. I have been talking to a few people on this subject and I have e-mailed Dr.Corneil. I will e-mail you all back with a clearer understanding soon.
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2/28/10 Receptors and Coding The way in which your body interprets a stimulus depends on the type of receptor that is activated. Thus, the perceived sensation is only determined by the type of receptor that is activated and not the type of stimulus. The is called Labeled Line Coding and it is the primary form of coding within the body. There are a few exceptions that you do not need to know.
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2/28/10 Types of Sensory Receptors There are many types of sensory receptors within the human body, each capable of transducing a specific sensory modality into action potentials that can be interpreted as a specific sensation by our central nervous system. Type Sensory Modality Transduced Example Photoreceptors Light Rods & Cones Mechanoreceptors Mechanical disruption (stretch/bending) Pacinian Corpuscle (skin) Chemoreceptors Specific Chemicals Olfactory Epithelium Receptors Nociceptors (pain) Tissue Damage C fibers (free nerve endings) Thermorecptors Temperature Changes
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2/28/10 Two Mechanisms for Sensory Transduction Specialized Neural Receptors Special Senses Receptor Differences - Specialized Nerve Ending - The nerve ending is part of the neuron - Specialized Receptor - Synapse onto primary nerve fibre Examples Pacinian Corpuscles or Meissners Corpuscles Hair Cells (in cochlea) The human body makes use of specialized nerve endings and specialized receptors to sense the various sensory modalities.
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2/28/10 Action Potentials vs. Receptor Potentials
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phystut4 - Somatosensory System Specialized receptors can...

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