L26 Flashcards
where does the preMC project to mainly
M1 and some direct connections with the hand muscles
what is the PreMC purpose
selection of appropriate motor plans (using sensory feedback)
what do the cell bodies with in the preMC signal
preparation for movement (motor set neurons)
and incorrect actions
what do the cell bodies within the preMC integrate
sensory aspects for motor acts regardless of how it was detected
when do premotor neurons fire
once the movement instructions are given (preparatory)
what does it mean by the preMC priming
lowers the threshold for the appropriate M1 neurons to fire
what occurs when there is damage to the premotor cortex
difficulty performing movements in response to verbal or visual commands. However, the individual can still respond to these commands in different settings
purpose of the supplementary motor area (SMA)
programming and initiation of complex movements using prior or remembered sequences of movements
the cell bodies within the SMA respond to…
sequence of movements
mental rehearsal of sequence movements
what are the cell bodies of the SMA involved in creating
an appropriate dynamic or complex motor output
monitoring the activity of the different motor areas using PET scan what would be seen when a task is simple
M1 and S1 firing
monitoring the activity of the different motor areas using PET scan what would be seen when a task is complex
M1, S1 and SMA
monitoring the activity of the different motor areas using PET scan what would be seen when a task is though of
SMA only
where does the association cortex receive input from
multiple sensory sources then projects to the premotor cortex and SMA
why is the association cortex necessary
ensures adaptive movements
what are the two major areas the association cortex consists of
posterior parietal cortex for integrating sensory
prefrontal cortex for working memory especially memory of consequences to actions
what occurs when there is damage to the association cortex
deficits in the perception and memory of spatial relationships
what is Apraxia
occurs when there is damage to the association cortex.
- is the disorder of voluntary movement not by paralysis or comprehension
- difficulty performing a movement out of context but can perform it naturally
what is contralateral neglect
happens when there is damage to the association cortex.
- inability to respond to stimuli on one side of the body contralateral to the lesion
- unaware of issue
draw a simple breakdown of voluntary movement of cortexes/areas of the brain and what they are doing
association - sma - preMC - M1 - spinal cord
experience - strategy - priming (sensory) - execution - movement via MU recruitment
what does it mean for somatotopic organization in motor cortex to be plastic
can alter the somatotopy with motor learning after injury to now allow neighboring areas to become larger if one area is not being used
