2.21 Motor System 4 Flashcards
tools used to measure hypotonia
- EMG recordings
- Ashworth scale
benefit to using EMG to measure hypotonia
to determine which factors are contributing to movement impairment
factors that may contribute to movement impairment
- contracture
- hyperreflexia
- cocontraction
- inappropriate timing of muscle activity
What does the Ashworth scale provide?
a subjective clinical assessment of resistance to passive stretch
UMN lesion types
- spastic CP
- stroke, middle cerebral artery
- SCI
common characteristics of UMN lesions
- paresis
- abn timing of muscle activity
- Babinski’s sign
- myoplasticity
In spasticity, what factors lead to movement dysfunction?
- abnormal supraspinal influences
- failure of normal neuronal selection
- consequent aberrant muscle development
motor disorders in spastic CP include:
- problems with coordination
- abnormal tonic stretch reflexes both at rest and during movement
- reflex irradition
- lack of postural preparation before movement
- abnormal cocontraction of muscles
What does stroke most commonly affect?
middle cerebral artery
two important things affected after stroke
- myoplasticity
- voluntary movement
movement disorders after middle cerebral artery stroke are consequences of
- paresis
- decreased fractionation of movement
- myoplasticity
hyperreflexia and stroke
rarely does hyperreflexia contribute significantly to movement limitations
What tract provides voluntary movement of the paretic limbs following stroke?
reticulospinal tract
complete SCI
all descending neuronal control is lost below the level of the lesion
incomplete SCI
function of some ascending and/or descending fibers is preserved within the spinal cord
