Motor processing - CORTEX

Question 1

Projections from motor cortex 4 and 6; also

Answer 1

3, 1, and 2 sensory cortex

Question 2

Crossed projections to lateral system -

Answer 2

distal movements

Question 3

Uncrossed, bilateral projections to ventromedial system -

Answer 3

proximal movements

Question 4

Projections to red nucleus and many brain stem nuclei

Answer 4

that’s all

Question 5

Areas involved in control of movement

Answer 5

a. primary motor cortex – area 4
b. supplemental motor area – superior portion area 6
c. premotor area – inferior portion of area 6
d. primary sensory cortex – area 3, 2, 1
e. posterior parietal cortex – areas 5& 7
f. area 8 – prefrontal eye fields
g. these areas project the 9 or more motor systems mentioned earlier, with some areas projecting more than one system

Question 6

multiple input from sensory areas - sensory input in movement:

Answer 6

a. not necessary to generate movements
b. important for sustaining movements, grasp etc.
c. and for precise movements of hands / fingers

Question 7

Multiple rep in the motor cortex - cortical areas may be more involved in body part movement, rather than

Answer 7

specific movement

Question 8

A cortical area is involved in movement of multiple adjacent body parts; that is,

Answer 8

overlapping areas

Question 9

Contralateral control for movement:

Answer 9

a. primary cortex for execution
b. premotor area for anticipation / planning
c. left frontal for initiation
– PET studies show that when moving the R arm there is activation of L primary, supplemental and premotor areas
– when only rehearsing the movements, there is activation only of the L premotor area
– no R hemi activation with R arm movement, but there is activation of the L premotor area