Somatosensation

The larger the area the greater the acuity of

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The larger the area the greater the acuity of processing Input contralateral SS2-mainly input from SS1 Somatotopic, input from both sides of the body Much of the output from SS1 and SS2 goes to association cortex in posterior o Somatosensory homunculus o Somatosensory agnosia Astereognosia Inability to recognize objects by touch o Pure cases are rare because other sensory deficits are usually present Asomatognosia Failure to recognize parts of one’s own body o The case of the man who fell out of bed Anosagnosia Lack of awareness of paralysis of a limv (“denial’) Misoplegia: “dislike” of a limb Control of pain o Pain control Peripheral vs. central (descending) control of pain Peripheral pain control
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Small nerve fiber (pain fiber)-inhibit inhibitory neuron Large nerve fiber (normal mechanoreceptors)-excite inhibitory neuron Inhibitory neuron-naturally continuously inhibits projection neurons, because you’re not feeling anything Pain projection neuron Pain gate- no input to the gate, no activity (gate is closed) Stimulus inhibits the inhibitory interneuron, and removes inhibition on the projection neuron, and excites the projection neuron, and sends a signal into the brain (standard pain pathway)
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