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18 Cards in this Set
- Front
- Back
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What are the general funxns of A-alpha nerve fibers? (ie. what do they conduct)
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Touch, pressure, proprioception
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What are the general funxns of A-beta nerve fibers? (ie. what do they conduct)
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Touch, pressure, proprioception
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What are the general funxns of A-gamma nerve fibers? (ie. what do they conduct)
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Touch, pressure, temperature, sharp pain
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What are the general funxns of A-delta nerve fibers? (ie. what do they conduct)
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Touch, pressure, temperature, sharp pain
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What are the general funxns of B nerve fibers? (ie. what do they conduct)
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Preganglionic autonomic fibers
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What are the general funxns of C nerve fibers? (ie. what do they conduct)
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dull pain, touch, pressure, temp
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Does a nerve that has more fibers conduct faster or slower then a nerve that has fewer fibers and is larger in diameter?
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slower. Larger diameter=faster
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What sensation do Meissner's corpuscles detect? What kind of receptor is it and where located? What is it composed of?
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Rapidly adapting mechanoreceptor sensing vibration located in the skin. It has a fluid filled lamellae of CT with a tunning fork in the middle
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What type of receptors are Merkel cells? How do they cause excitation and what are they composed of?
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Slow acting mechanorecptors sensing touch. Unmylinated nerve ending in close apposition w/ Merkel cell which has projections into skin and granules.
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As deformation of the skin occurs, what happens to action potentials released by mechanoreceptors?
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total # of action potentials increases
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Which receptive fields are smaller, cold or hot receptors?
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Cold receptors have smaller, spot-like receptor fields
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What type of sensory nerve fibers are mylinated?
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A-receptors
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What happens to nociceptors after cutting skin or causing tissue damage?
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They are sensitized by prostiglandin released from tissue (threshold lowered) and activated by bradykinin released by tissue
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How do activated nociceptors cause the inducation of more pain?
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Activated nociceptors release Sub P and calitonin blah that cause vasodilation and extraviasion of plasma leading to bradykinin release (activator). Sub P also acts on mast cells to release histamine, which triggers nociceptors.
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What receptor channels in nociceptors are g-coupled proteins?
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Bradykinin, Prostaglandin, Sub P, Histamine, Seratonin
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Which nociceptor ion channel detects ATP?
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P2X3, an ionotropic receptor.
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Which nociceptor ion channel detects H+?
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ASIC
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What is unique about some nociceptor Na channels?
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They are TTX resistant
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