Motor control - ventral Flashcards
What does the vestibulospinal tract do?
stabilize head and neck
What does the tectospinal tracts do?
ensures eyes remain stable as body moves
Where do the pontine and medullary reticulospinal tracts originate?
brain stem
What do the pontine and medullar reticulospinal tracts allow?
reflex maintain balance and body position
What do voluntary movements require?
inputs from motor cortex through latera; pathways
What does the motor cortex motoneurones directly free by communicating with the ventromedial pathways?
frees them form reflex control
What do the ventromedial pathways free?
frees spinal motorneurones from reflex control
If you are going to plan a movements, what do we need to know?
where is the body in space - somatosensory receptors
where it wants to go
select a plan to get there
What is the term for the sensory cortex?
S1
What is the term for the parietal cortex?
area 5 and 7
What is planning and instructing voluntary movement?
cortical areas
What did penfield study?
what sensory loss would occur of we made lesions in different parts of the brain
Describe the organisation of the precentral gyrus?
somatotopic organisation of precentral gyrus - same on condralateral side
What area is the primary motor cortex?
area 4
Where does all of the info about mental image of the body in space go to?
the somatosensory, propriocepive and visual inputs to posterior parietal cortex (areas 5 and 7)
What happens if there is a lesion to areas 5 and 7?
often have bizarre body images and may neglect or ignore one side of their body
Where are decisions made about what you want to do (actions you want to take and their outcome)?
prefrontal and parietal cortex
Where do axons from the prefrontal and parietal cortex converge?
area 6
What happens in area 6?
this is the junction where signals encoding what actions are desired are converted into how the actions will be carried out
processing action
Where does info from area 6 go to?
area 4
What happens in area 4 and 6?
area 6 = makes up you mind for you
area 4 = doing the action
How does area 4 do the action?
by activating neurones of CST and RST
When someone is trained to to an action, where is blood flow increased?
to the sensory (somatosensoiry and posterior parietal areas) and prefrontal cortex and areas 4 and 6 (motor)
Where are the PMA?
pre motor area - these are the thought process before movement
