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Terms in this set (15)
what causes spastic dysarthria caused by ?
•bilateral damage to the direct and indirect activation pathways of the central nervous system (CNS)
what hemisphere is damaged?
Left and right
what is direct activation pathway?
What is alternative term for indirect activation pathways?
what was spastic dysarthria known as?
Is spastic dysarthria caused by damage to UMN or LMN pathways?
Upper motor neuron
what happens if there is blockage in the middle cerebral artery in the left hemisphere?
There is regions that will not get blood supply and parts of that hemisphere will be damaged
what does a blocakge/stroke in the left hemisphere is not going to cause?
Bilateral damage and will not cause spastic dysarthria
Motor pathways that arise in motor cortex in the left and right lobes end up in the
brainstem (medulla) and this is where the left and right pathways are close to each other.
a stroke in the the brainstem can cause
bilateral damage and lead to a spastic dysarthia
PT can have a stroke in the brainstem can cause
bilateral damage that can cause spastic dysarthria
What are some clinical features?
•Excessive muscle tone= hypertonia
•Damage to direct activation pathways associated with positive Babinski sign (reflex typically seen in infancy
•release of a primitive reflex from CNS inhibition ( in a healthy adult our CNS inhibits the emergence of the these reflexes only expressed in infancy (babskini) ) with TBI they stop the inhibition and no longer works so you see the reflexies occur
•Damage to indirect activation pathways affects their predominantly inhibitory role, but in a number od disease process this role gets effected and gets too much of tone . The non inhibition throw the balance off tone of muscle which leads to:
2 types of impulses that exist in the motor system
exictory (telling muscles to contract) or inhibitory (not to contract) ,
•Binswanger's disease (vascular dementia)
When a person doesn't have adequate blood supply to the brain , so you lose neurons in areas across the brain and creates a pitted look the cortex The little creator = lucunar.
The area of where neurons die due to lack of blood supply= infracts . Which can create bilateral damage and smyptoms of spasitc dysarthria
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