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Somatic Senses Mechanoreception (touch-proprioception)
Touch: Course-fine touch, pressure, vibration [fast-slow], tickling, itch…
Proprioception: Static and dynamic Joint, skin and muscle receptors and “deep”
receptors… Thermoreception: (hot-cold sensation) Pain sensation
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Somatic Senses
Exteroceptive senses (body surface) Proprioceptive senses (body position) Visceral senses (inner organs) Deep senses (fasia, bone, muscle tissue)
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Sensory receptors
Iggo receptors: Fine touch, sense of texture
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Encoding the Sensory Signals
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Somatic Sensory Pathways
Two Fundamental Pathways 1. Dorsal column-medial lemniscus system
(Fine touch, vibration, concious proprioseption)
2. Anterolateral system (Temperature, crude touch, itching... etc.)
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Somatic Sensory Pathways
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Somatic Sensory Pathways
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Dorsal column- medial lemniscal pathway
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Dorsal column-medial lemniscal pathway
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Coarse touch-pressure;
Pain; Heat; Itch; Tickle Sexual sensations
Anterolateral System
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Neocortex
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Somatic sensory areas
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Motor and Sensory “Homunculus”
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Motor ve Sensory Areas
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Cortical “column”s Prof. Vernon Mountcastle
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Cortical “column”s
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Cortical coding
Stimulus intensity
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Cortical coding
Stimulus localization
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Sense of Joint Position
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The End