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17 Cards in this Set
- Front
- Back
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Classification of somatic senses |
1. Mechanoreception (tactile & proprioceptive) 2. Thermoreception 3. Nociception |
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detects increases or decreases in temperature |
thermoreceptors |
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detects tissue damage or release of specific pain-mediating molecules |
nociception |
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sensory modalities conveyed over the somatic sensory systems include: (mechanoreception) |
1. discriminative touch (precisely localized) 2. crude touch (poorly localized) 3. pressure 4. vibration 5. the senses of static body position and body movement (proprioception) |
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sensations that originate from the body surface structures, such as the skin and sub-q tissues, as well as deeper structures including muscle, fascia, and tendons |
exteroceptive |
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sensory signals that arise from internal organs (endoderm ally derived structures) |
visceral sensations |
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stimulated by mechanical displacement |
mechanoreceptive |
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touch, pressure, vibration, tickle, and itch |
Tactile (mechanoreception) |
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static position, rate of change |
position or proprioceptive (mechanoreception) |
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classifications of somatic sensations |
1. Mechanoreceptive (tactile and proprioreceptive) 2. Thermoreceptive 3. Pain |
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at least six types of tactile receptors |
1. Free nerve endings 2. Meissner's corpuscles 3. Expanded tip receptors 4. Hair end organ 5. Ruffini's end organ 6. Pacinian corpuscles |
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detect touch and pressure; found everywhere in the skin and other tissues, even in cornea |
free nerve endings |
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- elongated, encapsulated nerve ending of a large myelinated sensory nerve fiber - found on non-hairy skin, fingertips/lips - rapidly adapting and detect movement of light objects over skin |
Meissner's corpuscles |
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- hairy and non-hairy skin - respond rapidly then slowly adapt - detect steady state-concious touch - Iggo dome receptor
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Expanded tip receptors (Merkel's discs) |
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- entwined about the base of each hair on the body surface - rapidly adapting - detect movement of objects over the skin surface that displace hairs |
Hair end-organs |
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encapsulated endings located in skin and deeper tissues, as well as joint capsules - exhibit little adaptation: signal continuous touch and pressure applied to the skin or movement around a joint |
Ruffini's end-organs |
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- present in skin and deep tissue fascia - adapt rapidly - especially important for detecting vibration or other rapid change in mechanical state |
Pacinian corpuscles |
