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21 Cards in this Set
- Front
- Back
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What is the principal component of myelin?
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Lipid
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The nerve axon and myelin sheath together form what structure?
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Peripheral newe fiber
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Peripheral nerve fibers are covered by what?
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Endoneurium
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What are bundles of nerve fibers referred to as?
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Fascicles
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What is the layer that covers the fascicles called?
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Perineurium
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What are the functions of the perineurium?
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Provide tensile strength
Acts as blood-brain barrier protecting against infection |
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A collection of fascicles together form a what macroscopic structure?
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Peripheral nerve
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What is the outermost layer covering a peripheral nerve?
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Epineurium
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What is the general function of the epineurium?
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Protect the nerve against external pressure
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An action potential triggers what chemical sequence at the neuromuscular junction?
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Calcium influx and acetylcholine (ACh) release
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What then occurs at the motor endplate?
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ACh leads to an influx of sodium and results in depolarization of the cell
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What is the normal resting potential of the cell?
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-70 mV
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What quality of sensation corresponds to each of the following corpuscle types: Meissner?
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Light touch (tactile corpuscles) type of mechanoreceptor (only present in (glabrous skin)
Moving two point discrimination quickly adapting |
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Merkel?
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Light pressure and texture
Static two point discrimination/slow adapting |
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Pacini?
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Deep pressure touch and high-frequency vibration
Quickly adapting |
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Rufiini?
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Skin stretch/slow adapting
mechanoreceptor (exist only in the glabrous dermis) Temperature |
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What is the best clinical test of Meissner corpuscle function?
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Moving two-point discrimination
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What is the best clinical test of Merkel corpuscle function?
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Static two-point discrimination
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Are most reflex arcs monosynaptic or polysynaptic?
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Polysynaptic
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Pain fibers are principally of which type?
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C
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Are pain fibers generally myelinated?
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No, generally unmyelinated
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