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17 Cards in this Set
- Front
- Back
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Name the four corpuscle types and their respective receptive field size.
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Pacinian - large, Meissner's - small, Merkel's - small, Ruffini's - large
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What is the name of the pathway of touch signals to the brain?
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The dorsal column medial lemniscal pathway.
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In which of the brain's lobes is the primary sensory cortex?
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The parietal lobe.
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What is a homunculus?
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A miniature man, in terms of somatotopy in the primary sensory cortex of the brain
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In terms of the sense, what is neglect syndrome?
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The brain's ignorance of a part of the body or the surrounding world.
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What is agnosia?
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The inability to recognize objects despite sensory input.
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What is astereoagnosia?
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The inability to recognize objects by touch, even though they can be recognized by sight
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Which tract is involved in temperature signalling?
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The spinothalamic tract.
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Where does decussation of touch occur?
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The medulla.
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What is lateral inhibition?
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The increase of contrast between cells receiving or not receiving input by an active cell's inhibition of an inactive cell.
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What is nociception?
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Pain recognition.
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What chemicals, when released from damaged tissue, can produce nociception?
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Prostaglandins, histamine, and bradykinin.
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What is analgesia?
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The lack of pain recognition.
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How do drugs like aspirin and ibuprofen produce temporary analgesia?
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They inhibit prostaglandin formation.
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Along which fibers do pain signals travel to the dorsal horn of the spinal cord?
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Unmyelation C fibers and myelinated A gamma fibers.
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What is the gate theory and who proposed it?
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It is the theory of lessening pain in an area by stimulating the area around it. Melzack and Wall proposed it.
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What systems contain peptides such as enkephalin and beta-endorphin and may serve to inhibit pain transmission?
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The endogenous opioid systems.
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