chp 18 - Chapter 18 Somatic and special senses Click to...

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Click to edit Master subtitle style Chapter 18 Somatic and special senses Cinnabo n
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Sensory systems ¢ let us detect stimuli from environment and react ¢ Requires: l Stimulus (signal from environment) l Receptor – detects SPECIFIC stimulus – converts it to a neural impulse (action potential) l Brain – receive impulse, integrate it, produce a perception of the stimulus
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Senses ¢ General (found throughout body) l Somatic Tactile, thermal, pain, proprioception l Visceral Conditions in internal organs ¢ Speicalized (localized) l Vision, hearing, taste, smell, balance
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Examples of Stimuli ¢ Light (electromagnetic spectrum) ¢ Heat/cold ¢ Pressure/Pain ¢ Mechanical energy (sound waves) ¢ Chemicals (CO2, Na+ etc.) ¢ Stretch (proprioception – tendons/muscles)
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Receptors ¢ 1 - can be neurons ¢ Free nerve endings– naked dendrite detects stimulus, initiates impulse l Smell, pain, temp., tickle, itch ¢ Encapsulated nerve endings – dendrites wrapped in c.t. capsule l Enhance sensitivity/selectivity of recep. l Meissner/Pacinian corpuscles l Pressure, vibration, touch
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Fig. 18.3
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Fig. 18.3
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Fig. 18.3
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Receptors ¢ 2. unique cell type ¢ Receives stimulus, communicates signal to adjoining neuron l ~ Rods/cones – eye (photoreceptors) l Taste buds – mouth (tastereceptors) l Hair cells -ear
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¢ Receptors are distinct and localized in specific parts of head
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chp 18 - Chapter 18 Somatic and special senses Click to...

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