Brain and Behavior
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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.
The biceps brachii reflex tests the ______ nerve at the ___ level of the CNS.
The triceps brachii reflex tests the ______ nerve at the ___ level of the CNS.
The brachioradialis reflex tests the ______ nerve at the ___ level of the CNS.
The knee/quadriceps reflex tests the ______ nerve at the ___ level of the CNS.
femoral nerve at the L2-L4
The ankle reflex tests the ______ nerve at the ___ level of the CNS.
The Jaw Jerk reflex tests the ______ nerve at the ___ level of the CNS.
- The trigeminal nerve
Absence of the pupillary light reflex and oculomotor components of the VOR indicate a lesion of the ___.
Absence of the corneal reflex and jaw jerk reflex indicate a lesion in the ___.
Absence of the gag reflex and entire vestibulOcular reflex indicates a lesion in the level of the ___.
EARLY signs of lower motor neuron injury include:
- 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
What does flaccid paralysis mean?
patient has hypotonia and weakness
True or False
A patient will have decreased muscle mass with an acute lower motor neuron injury.
- An acute injury will not have had enough time to allow for the muscle to atrophy.
What is the one symptom that is specific for an acute lower motor neuron dysfunction?
A patient with a late lower motor neuron injury will have what symptoms? (5)
- muscle atrophy
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.
- muscle atrophy and fibrillations
Isolated afferent fiber injury will result in decreased muscle tone and reflexes but not___ ___.
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 ___.
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.
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