201-L39-genprin-2009ND slides

201-L39-genprin-2009ND slides - Sensory Function General...

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Sensory Function: General Principles Stimulus Electrical signal Receptor
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General Senses Receptors distributed throughout body - common on body surfaces - not within specialized ‘sense organs’ 4 types: 1. Pain (‘nocioceptors’) 2. Temperature (‘thermoreceptors’) 3. Touch, pressure, body position (‘mechanoreceptors’) 4. Chemical stimuli (‘chemoreceptors’ - O 2 , CO 2 )
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General Senses - Somatic vs Visceral Somatic - body surface Visceral - internal organs (stomach ache, ‘gut cramps,’ etc.) (surface temp, touch, pain & muscle soreness)
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Special Senses receptors congregated in specialized ‘sense organs’ 5 types: 1. Smell (‘olfaction’) - nose 2. Taste (‘gustation’) - tongue 3. Balance/Equilibrium- ear 4. Sound (hearing) - ear 5. Sight (vision) - eye
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Specificity of Sensation Regardless of stimulus ‘modality,’all sensation is ‘read’ in the CNS as electrical signals We can ‘discriminate’ between different types of stimuli because different receptor ‘types’
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This note was uploaded on 03/24/2010 for the course PSIO 201 taught by Professor Stanescu during the Spring '08 term at Arizona.

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201-L39-genprin-2009ND slides - Sensory Function General...

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