exam two (ch.14) Flashcards

1
Q

highest level of motor control involves association areas and basal ganglia which functions to

A

devise strategy

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2
Q

the middle level of motor control involves the primary motor cortex and cerebellum which funtion to

A

fine tuning strategy

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3
Q

execution of the motor strategy which is controlled by what structures

A

brain stem and spinal cord

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4
Q

_____ system influences all levels of the motor system

A

somatosensory

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5
Q

lateral pathways have cortical control and they do what movements

A

voluntary movements of distal limbs

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6
Q

ventromedial pathways of the brain stem control

A

postural muscles

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7
Q

the rubrospinal tract originates in ___ ___ (midbrain)

A

red nucleus

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8
Q

what motor pathways controls posture and locomotion in the brain

A

vestibulospinal and tectospinal and pontine reticulospinal and medullary recticulospinal

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9
Q

motor pathway that is ventromedila and does head balance and head turning

A

vestibulospinal

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10
Q

motor pathway that is ventromedial and does orienting response

A

tectospinal

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11
Q

the ventriomedial pathways originate where

A

brain stem

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12
Q

ventromedial pathway that enhances antigravity
reflexes of the spinal
cord (maintain
standing)

A

pontine reticulospinal

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13
Q

ventromedial pathway that liberates antigravity
muscles from reflex
(opposite of the other
tract)

A

medullary reticulospinal

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14
Q

area 4 in the motor cortex is commonly called

A

primary motor cortex or M1

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15
Q

area 6 in the motor cortex is commonly called

A

higher motor area

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16
Q

the lateral region of the higher motor area is the ___ ____; the medial region is _____

A

premotor area and supplementary motor area

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17
Q

Microstimulation of prescribed
area of M1 normally elicits
whisker movement; Cut nerve that supplies whisker
muscles; Microstimulation now causes forelimb movement, this is an example of?

A

neuroplasticity (rewiring M1)

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18
Q

area 5 and 7 are involved in _____ somatosensory processing

A

complex

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19
Q

posterior pariteal (Area 5 and 7) dysfunction characterized by inability to identify objects by feeling them
even though sense of touch appears otherwise normal

A

astereoagnosia

20
Q

results from posterior parietal lesion;
part of the body or world is completely ignored

A

neglect syndrome

21
Q

consolidates inputs
from somatosensory areas 1, 2 and 3

A

area 5

22
Q

Inputs from higher-
order visual cortical areas such as MT

A

area 7

23
Q

Abstract thought, decision making and anticipating consequences of action

A

prefrontal cortex

24
Q

area where signals turned into commands specifying how actions will be performed

A

area 6

25
Q

area 6 (pre motor) also contains _____ neurons

A

mirror

26
Q

outputs to the alpha motor neurons from M1 come from pyramidal cells in layer

A

V

27
Q

Activity of M1 neurons encode _____ and _____ of movement

A

force and direction

28
Q

Activity of each cell:
Represents a single “vote” and the direction of movement is dictated by a ____ ____ in M1

A

population vector

29
Q

what brain structure does selection and initiation of “motivated” movements

A

basal ganglia

30
Q

the basal ganglia recieves input from all aread of the neocortex and limbic cortex including ___ ____ and the ___ ____ from substantia nigra

A

motor cortex and dopaminergic system

31
Q

B.G motor loop has an excitatory connection from ____ to ____

A

cortex to putamen

32
Q

cortical activation to basal ganglia ___ putamen which inhibits ___ ____

A

excites; globus pallidus

33
Q

excitation of globus pallidus results in

A

release of VLo (thalamus) from inhibition (off switch turned on)

34
Q

VLo activity in turn stimulates activity in ____

A

SMA (supplementary motor area)

35
Q

what disease is characterized by trouble initiating willed movements due to increased inhibition of the thalamus of basal ganglia

A

parkinsons

36
Q

L-dopa works to facilitate production of dopmaine to increase ____ activity

A

SMA

37
Q

Uncontrolled movements due to decreased inhibition of the thalamus by basal ganglia; Loss of neurons in caudate, putamen, globus pallidus (also
cortex

A

huntingtons

38
Q

the vermis of the cerebellum contributes to ____ pathways; axial musculature

A

ventromedial

39
Q

the cerebellar hemispheres contribute to ____ pathways; limb movements

A

lateral

40
Q

the motor loop through the lateral cerebellum allows for proper execution of ___ ____ multi joint movements

A

planned, volunatry

41
Q

Axons from layer V
pyramidal cells in the
sensorimotor cortex
(Areas 4, 6, and sensory
cortex) form massive
projections to pons which
then projects to the
cerebellum

A

pontine nuclei

42
Q

cerebellum projects through the thalamus to the

A

motor cortex

43
Q

there is an ___ connection from cortex to putamen

A

excitatory

44
Q

exciting the putamen inhibits the ___ ____

A

globus pallidus

45
Q

when the globus pallidus is inhibited there is the release of _____ from inhibition

A

VLo (thalamus)

46
Q

when VLo is switched on what happens

A

activity will begin in SMA; which focuses behavior

47
Q

there is also an _____ pathway that antagonizes diect pathway of motor function (they work together to select appropriate movements)m

A

indirect