Dental Neuroscience

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Dental Neuroscience
2012-03-05 16:38:26
Dental Neuroscience UMN 2012

UMN Neuro 2012
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  1. Mechanoreceptors use which type of fibers?
  2. Termal receptors use which type of fibers?
    • Heat - C-fibers
    • Cold - A-delta
  3. Proprioceptors in joints contain which type of fibers?
    A-alpha - are fast for signaling of body position at tendons and muscles
  4. Nociceptors contain which type of fibers?
    A delta and C fibers
  5. Cutaneus receptors include:
    • Mechanoreceptors
    • Thermal receptors
    • Nociceptors
  6. Receptor types in joints/tendons/muscles
    • Mechanoreceptors (A beta)- pressure receptors of stretch
    • Proprioceptors (A alpha)
    • Nociceptors (A delta and C) - excited by intense pressure stretching or chemicals
  7. Receptors in viscera:
    • Mechanoreceptors - stretching or pressure on organs
    • Nociceptors - deep, dull pain from viscera (A delta, C)
  8. Receptors in bone:
    Nociceptors - dull, aching pain -- mostly C fibers (some A delta)
  9. Transduction in sensory receptors
    • Adequate stimulus
    • Change in membrane potential
    • Transmission of action potential
    • Adaptation
  10. Transduction in a mechanoreceptor:
    • Displacement of hair
    • Stretch sensitive channels on dendrite open
    • Influx of Na+
    • Voltage sensitive Na and K channels open
    • Nerve impulse
  11. Adaptation of mechanoreceptors
    • Slowly - proprioceptors
    • Rapidly - hair receptors
  12. Phasic Receptor
    Normally not active. Ex: Nociceptors
  13. Tonic Receptor
    Always active. Ex: Proprioceptors
  14. Sensory afferents synapse and relese neurotransmitter at the _________
    Dorsal horn (except pain fibers)
  15. Afferent pain fibers are ________
    high in the dorsal horn
  16. Steriognosis is:
    The perception of the size and shape of objects by touch
  17. First order neurons transmit from the _____ to the _____.
    Periphery; Brainstem
  18. Second order neurons transmit from the ________ to the _______.
    Brainstem to the thalamus
  19. Connective tissue is found in the ____ layer of skin:
  20. The 2 types of encapsulated, layered skin receptors are:
    • Pacinian corpuscles
    • Meissner corpuscles
  21. A type of encapsulated, thin capsule of skin receptor is:
    Ruffini endings
  22. Two types of accessory, nonencapsulated structures are:
    • Endings around hairs
    • Merkel endings
  23. The three types of skin receptors are:
    • Encapsulated
    • Nonencapsulated
    • Free nerve endings
  24. Pacinian corpuscles are located in what types of skin?
    Hairy and hairless
  25. Pacinian receptor endings are found in the:
    Deep epidermis (layers of epithelial cells; ECF)
  26. Pacinian corpuscles are _____ adapting
  27. Function of Pacinian corpuscle is:
    • To record vibration applied to surface of skin
    • Texture discrimination
  28. Meissner corpuscles are located in _____ skin:
    Hairless only in superficial dermis
  29. Receptor endings of Meissner corpuscles in:
    Nestled in epithelial layer
  30. Meissner corpuscles are ______ adaptive
  31. Function of Meissner corpuscles is:
    • Touch sense
    • Vibration
    • Texture discrimination
  32. Ruffini endings are found in ____ skin:
    Hairy and hairless; dermis
  33. Receptor endings of Ruffini endings are:
    Collagen wrapped around ending in dermis
  34. Ruffini endings are ______ adaptive:
  35. Function of Ruffini endings is:
    Detect skin stretching and pressure
  36. Dermatomes are:
    cutaneus territories innervated by spinal nerves (cervical, thoracic, lumbar, sacral)