anatomy Ch19h - Human Anatomy McKinley & O'Loughlin...

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Human Anatomy Chapter 19: The Senses: General And Special Senses: General and Special o Two classes of receptors: 1. general senses 2. special senses Receptors The Receptive Field of a Receptor Tonic vs. Phasic Receptors o Tonic receptors o Phasic receptors 3. Adaptation Classification of Receptors o Three criteria may be used to classify receptors: 4. stimulus origin 5. receptor distribution
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6. modality of stimulus 1. Stimulus Location o Based on stimulus location there are three types of receptors: exteroceptors, interoceptors and proprioceptors Exteroceptors o Detect stimuli from the external environment. Interoceptors o Also called visceroceptors. 7. detect stimuli in internal organs (viscera) Proprioceptors o Located in muscles, tendons, and joints. o Detect body and limb movements, skeletal muscle contraction and stretch, and changes in joint capsule structure. 2. Receptor Distribution o General senses 8. Somatic 9. Visceral o Special senses 3. Modality of Stimulus o Chemoreceptors o Thermoreceptors o Photoreceptors o Mechanoreceptors o Baroreceptors
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o Nociceptors General Senses Tactile Receptors Tactile Receptors o Unencapsulated 10. free nerve endings 11. root hair plexuses 12. tactile discs o Encapsulated 13. Krause bulbs 14. lamellated corpuscles 15. Ruffini corpuscles 16. tactile corpuscles Gustation o Gustatory receptors are housed in specialized taste buds on the dorsal surface of the tongue. 4 Types of Papillae
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anatomy Ch19h - Human Anatomy McKinley & O'Loughlin...

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