Topic 8.8 Flashcards
5 structures that influence motor functions
- medulla
- midbrain
- cerebellum
- basal ganglia
- motor cortex
Which brodmann area is the primary motor cortex?
brodmann’s area 4
Which brodmann area is the premotor cortex?
brodmann area 6
Where does the movement “decision” begin?
in associative areas or the cortex
What is the motor plan?
It identifies the muscles that need to contract, how much they need to contract, in what sequence
Which structures will also influence the planning and execution stages of the motor plan?
basal ganglia and cerebellum
What is the primary motor cortex responsible for?
execution of a movement
How is the motor cortex organized?
topographically (musculotropic organization)
Which muscle is NOT controlateral?
The tongue
What are the premotor cortex and supplementary motor cortex responsible for?
generating a plan of movement
What are the lateral spinal motor pathways responsible for?
for conscious control of movements of the extremities
What are the 2 lateral motor pathways?
- lateral corticospinal tracts
- rubrospinal tract
1st and 2nd order neurons of the lateral corticospinal tract
1st : betz cells + cells of lamina V of cortex
2nd : pontine nuclei
Decussation of lateral corticospinal tract
in the medulla oblongata
Course in SP of lateral corticospinal tract
in the controlateral lateral funiculus
Destination of lateral corticospinal tract
It synapses with motor neurons in the ventral horn
Function of lateral corticospinal tract?
Fine and precise movement
1st and 2nd order neurons of rubrospinal tract
1st : red nucleus (magnocellular portion)
2nd : alpha motor neurons (upper cervical segments)
Where does the rubrospinal tract decussate?
anterior tegmentum decussation (in midbrain)
Course of rubrospinal tract in SP
controlateral lateral funiculus
destination of rubrospinal tract?
Synapse with motor neurons in ventral horn
Function of rubrospinal tract (2)
- muscle tone, body position
- gait
What are medial motor pathways involved in?
unconscious control of movements in the extremeties