lecture 10 Flashcards
what is gegenhalten seen in
severe dyspraxia/ apraxia `
spasticity is a ___ disorder characterized by a ____ depended _____ in ______ stretch reflexes with exaggerated _____ ______ resulting from ____________ of the stretch reflex
- motor
- velcoity
- increase
- tonic
- tendon jerks
- hyper excitability
if there is neural overactivity from an upper motor lesion and a spinal lesion happens what would be a results
hyperrefelxia bc alpha and gamma neurons are over stimulated
if there is neural overactivity from an upper motor lesion and a cerebral lesion happens what would be a results
excessive reticulospinal drive to motor neurons leading to muscle contractions
what is myoplasticity
contracture , atrophy, weak actin myosin binding
corticospinal tract from precentral cortex control what
voluntary mvmt
what are the 2 supra segmental contribution to spasticity
pyramidal tracts and extrapyramidal tracts
what is thought to help with some mvmt when CST is damaged
venteralmedial reticulospinal tract
what does isolated lesions of the primary motor cortex induce
weakness and decreased reflexes
what does the anterior limb of the internal capsule carry
sensory fibers
does the ventromedial reticulospinal tract cross
no
where does the ventromedial RST come from
pons
where does the dorsolateral RST come from and does it cross
medulla and yes it crosses (50% cross immediately and 50% does not cross)
where is the ventromedial reticular formation
in the medulla and it is an inhibitory area
what is the ventromedial reituclar formation closesly controlled by
premotr cortex / corticoreticular tract
