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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
Somatic Senses
Exteroceptive senses (body surface) Proprioceptive senses (body position) Visceral senses (inner organs) Deep senses (fasia, bone, muscle tissue)
Sensory receptors
Iggo receptors: Fine touch, sense of texture
Encoding the Sensory Signals
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.)
Somatic Sensory Pathways
Somatic Sensory Pathways
Dorsal column- medial lemniscal pathway
Dorsal column-medial lemniscal pathway
Coarse touch-pressure;
Pain; Heat; Itch; Tickle Sexual sensations
Anterolateral System
Neocortex
Somatic sensory areas
Motor and Sensory “Homunculus”
Motor ve Sensory Areas
Cortical “column”s Prof. Vernon Mountcastle
Cortical “column”s
Cortical coding
Stimulus intensity
Cortical coding
Stimulus localization
Sense of Joint Position
The End
