12 -- Somatosensory systems part 1

12 -- Somatosensory systems part 1 - Somatosensation...

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Unformatted text preview: Somatosensation Somatosensation 4 Categories (Modalities): Discriminative Touch Discriminative Touch (pressure, vibration, texture) Proprioception Proprioception (body position sense) Pain Pain Temperature Temperature- all have their own set of receptors for transduction of stimuli into neural signals and they take (mostly) different pathways to the brain for processing The The QUALITY QUALITY of a stimulus (what it represents and where it is) is determined by the of a stimulus (what it represents and where it is) is determined by the properties of the relevant receptors and their central targets properties of the relevant receptors and their central targets The The QUANTITY QUANTITY (strength) is determined by the (strength) is determined by the rate rate of action potential discharge of action potential discharge triggered by the receptor being stimulated triggered by the receptor being stimulated Somatosensation Discriminative Touch Discriminative Touch (pressure, vibration, texture) mediated by MECHANORECEPTORS MECHANORECEPTORS in skin and connective tissue neurons with specialized end organs (listed below) at dendritic terminal are sensitive to physical distortion Somatosensation Discriminative Touch Discriminative Touch (pressure, vibration, texture) mediated by MECHANORECEPTORS MECHANORECEPTORS in skin and connective tissue Some properties of interest: Encapsulated terminals Inside each specialized Inside each specialized encapsulation, the neurons encapsulation, the neurons dendrite contains dendrite contains mechanosensitive ion mechanosensitive ion channels channels that open/close that open/close when the membrane is when the membrane is deformed in some way deformed in some way Somatosensation Discriminative Touch Discriminative Touch (pressure, vibration, texture)...
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12 -- Somatosensory systems part 1 - Somatosensation...

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