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PSYB65H3 (479)
Ted Petit (185)
Chapter 5

Chapter 5 Notes

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Ted Petit

Chapter 5The Sensorimotor SystemPart ISENSORITMOTOR SYSTEMAccurate movements depend on our ability to moniter the positionplacement of our body and its parts which relies on somatosensory feedback from our joints tendons muscles and skinSomatosensory ReceptorsThe somatosensory info we receive about the world comes from sensory receptors in the skinA number of different sensations vibration pressure pain and touch3 types of receptorsNociception Sensations of pain and temperatureHapsis Sensations of fine touch and pressureProprioception Awareness of body and its position in spaceRegardless of function most of the sensory receptors in the skin are mechanoreceptorsMechanoreceptorsReact to distortion such as bending or stretchingDifferent types of mechanoreceptors although most are axons that have mechanosensitive ion channels on themAxons that contain these ion channels are primary afferent axons that enter the spinal cord through the dorsal rootsSpinal Cord is organized into dorsalventral root gangliaDorsal Root Ganglia are somatosensoryVentral Root Ganglia motor30 pairs of spinal nerves each made up of dorsal and ventral roots that exit the spinal cord30 dorsal roots of spinal cord innervates different areas of the skin referred to as dermatomesSomatosensory Pathways in the Brain2 main sensory pathways in the brain1 Dorsal Spinothalamic TractResponsible for transmitting info about proprioceptionhapsisEnter spinal cord through the dorsal root gangliaSynapses ipsilaterally in the dorsal column nuclei of the spinal cord2 Ventral Spinothalamic TractThe tract through which nociceptive info travels separatelyEnters the spinal cord through the dorsal root ganglion Ascends the spinal cord contralaterallyAlthough somatosensory info for hapsisnociception is transmitted separately because they send information through the same pathways to the same destinations damage to the brainstem or thalamus results in equal loss of both hapsisnociception1
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