Motor control: descending commands and clinical eval Flashcards Preview

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Flashcards in Motor control: descending commands and clinical eval Deck (12):

where does planned movement begin

premotor and supplementary motor cortex


what can be measured to see planned movement and where

B-potential before movement happens in the pre-motor area


what are the 4 descending motor pathways and which are in stem

1. corticospinal
2. rubrospinal - stem
3. vestibulospinal - stem
4. reticulospinal - stem


what are 4 ways the brain controls movement

1. control reflex gain
2. select motor program
3. activate groups of M-neurons
4. activate indiv. muscles


what is special about fine finger movements

in humans there is a monosynaptic control from the cortex


5 signs of UMn lesions

1. paralysis
2. incr. reflexes (clonus and spastcity)
3. clasp knife rigidity ( incr. tone)
4. babinski response


5 signs of LMN lesion

1. atrophy
2. fasiculations
3. decreased tone (not really)
4. decresed reflexes
5. no babinski


2 disorders of tone

1. spasticity - increased velocity dependent tone with exageratted stretch reflexes
2. clonus - rapid succession of stretch reflexes, best felt at ankle


what is sign in stroke UMN

upper body flexor and lower body extensor


2 aspects of exaggerated stretch reflexes

1. increased amplitude
2. increased briskness


what is clasp knife phenomenon

mixed spacticity and altered flexion reflex


pharma and non pharm treatment of spactisicy

pharma - weaken muscles - botox or reduce transmission between affert and motoneuron - baclofen
non-pharm - PT, stretch

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