Cervical Spine Case: Spinal Tracts (MODULE 9) Flashcards
UMN versus LMN Findings
UMN
Reflexes
Tone
Pathological Reflex
Fasciciulations
Reflexes - Hyper >2+/4+
Tone - Spactic (increased tone not from pain)
Pathological Reflex - Yes (positive Babinski sign or clonus, or other)
Fasciculations - No
Motor neurons cause skeletal muscles to contract, directly as _____ or
indirectly as the ___________ and Extra-Pyramidal tracts.
GSEs
Pyramidal
UMN versus LMN Findings
LMN
Reflexes
Tone
Pathological Reflex
Fasciciulations
Reflexes - Hypo<2+/4+
Tone - Flaccid (decreased tone, not from lack of conditioning )
Pathological Reflex - no
Fasciculation - Yes (spontaneous contractions (twitch) due to muscle cell death)
Upper motor neurons (UMNs) are wholly within the ____, Lower Motor
Neurons (LMNs) are ____ (or SVE… more on that later) neurons.
CNS
GSE
Many, many neurons synapse on the _____, so, loss of the UMNs that
control the GSE will leave it “exposed to other depolarizing input like the
reflex GSAs
LMNs
both the stretch reflex and the withdrawal reflex are highly
excitatory… so without the UMN, the result would be “spastic paralysis.
Paralysis because you could not initiate movement, and spastic because
of all those unregulated inputs.
What would happen with a UMN lesions?
Muscle spasticity b/c the LMN continues to fire without the opposing stimulus
Loss of GSE = ?
No motor function
T or F
A lesion in the internal capsule would
affect the entire tract.
T
T or F
A lesion at C5 would affect the upper
and lower extremity, but a lesion at T12
would affect only the lower extremity.
T
T or F
Like the motor tract lesions, loss at a certain level would apply to
all the areas below that lesion.
T
T or F
If the lesion were at C5, then sensory information from there and
above the lesion would be “lost”
F
If the lesion were at C5, then sensory information from there and
below the lesion would be “lost”
T or F
C5 lesions would affect both
the upper and lower extremity, and lesions below T12 would only
affect the lower extremity, not the upper extremity.
T
T or F
the general rule will be that CNS sensory or motor loss
in the cervical spine would extend to include the lower extremity as well we often test the lower extremity first if the injury is in
the cervical spine
T
If the loss is central, then the lower extremity would
be affected if the cervical spine is affected…
During the babinski foot test if the toes extend after the bottom of the foot is scraped what would this mean?
(Flare) = CNS/UMN lesion
Why do LMN show a hypo reflex?
GSE is innervated the skeletal muscle
Hypo because if GSE is not innervated the muscle for the reflex
