Brain and Behavior

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Author:
courtney3672
ID:
17972
Filename:
Brain and Behavior
Updated:
2010-05-05 18:16:17
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Lower Motor Neuron Dysfunction
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Exam 3 Material
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  1. Stretch reflexes are a dynamic response to a rapid __ inc or dec?__ in muscle length. The response includes excitation of ___ afferent fibers after receptor stimulation.
    • increase
    • 1a
  2. The biceps brachii reflex tests the ______ nerve at the ___ level of the CNS.
    • musculocutaneous
    • C5, C6
  3. The triceps brachii reflex tests the ______ nerve at the ___ level of the CNS.
    • radial nerve
    • C6-C7
  4. The brachioradialis reflex tests the ______ nerve at the ___ level of the CNS.
    • radial nerve
    • C5-C6
  5. The knee/quadriceps reflex tests the ______ nerve at the ___ level of the CNS.
    femoral nerve at the L2-L4
  6. The ankle reflex tests the ______ nerve at the ___ level of the CNS.
    • tibial
    • S1
  7. The Jaw Jerk reflex tests the ______ nerve at the ___ level of the CNS.
    • The trigeminal nerve
    • pons
  8. Absence of the pupillary light reflex and oculomotor components of the VOR indicate a lesion of the ___.
    midbrain
  9. Absence of the corneal reflex and jaw jerk reflex indicate a lesion in the ___.
    pons
  10. Absence of the gag reflex and entire vestibulOcular reflex indicates a lesion in the level of the ___.
    medulla
  11. EARLY signs of lower motor neuron injury include:
    (4)
    • 1) paralysis/ weakness of muscles during active resistance
    • 2) hypotonia/ atonia: decrease resistance to passive movement
    • 3) hyporeflexia/ areflexia: decreased response to stretch and cutaneous reflexes
    • 4) fasciculations: spontaneous contractions of motor units due to loss of nerve supple
  12. What does flaccid paralysis mean?
    patient has hypotonia and weakness
  13. True or False
    A patient will have decreased muscle mass with an acute lower motor neuron injury.
    • False.
    • An acute injury will not have had enough time to allow for the muscle to atrophy.
  14. What is the one symptom that is specific for an acute lower motor neuron dysfunction?
    fasciculations
  15. A patient with a late lower motor neuron injury will have what symptoms? (5)
    • paralysis/weakness
    • muscle atrophy
    • hypotonia
    • hyporeflexia
    • fibrillations
  16. The main difference in symptoms between an acute and late LMN injury is that acute will have ___ while late has ____ and ____. The other symptoms are similar.
    • fasciculations
    • muscle atrophy and fibrillations
  17. Isolated afferent fiber injury will result in decreased muscle tone and reflexes but not___ ___.
    muscle atrophy
  18. A unilateral lesion of an afferent limb of the trigeminal nerve on the right will result in loss of the direct and consensual response on the ____ _____ but the direct and consensual responses will be present on the ___.
    • right side
    • left
  19. An acute unilateral lesion to the afferent fibers of the vestibulo-ocular reflex will result in ____ of both eyeballs during head movement. This will also happen at rest in the acute phase.
    nystagmus

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