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Physiology Exam VI > Coricomotor System > Flashcards

Coricomotor System Flashcards

1
Q

What are the 3 stages of events that occur before voluntary movement

A
  1. where is the thing
  2. are you going to move the thing?
  3. move the thing?
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2
Q

what brodman’s area is the primary motor cortex

A

4

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3
Q

cingulate motor cortex

A

3 small motor areas in the rostral cingulate gyrus

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4
Q

function of reticulospinal tracts

A

control of axial and proximal motor pathways

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5
Q

what happens if you cut the reticulospinal tracts

A

spasticity (maybe)

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6
Q

medial system motor pathways

A

reticulospinal tracts

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7
Q

lateral system motor pathways

A

rubrospinal tract

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8
Q

function of rubrospinal tract

A

control distal and proximal muscles of upper extremity

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9
Q

where does red nucleus recieve most of its input from

A

cerebellum and primary motor complex

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10
Q

what do rubrospinal tract fibers intermingle with after they cross

A

lateral corticospinal tract

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11
Q

origin of motor corticobulbar fibers

A

motor areas of cerebral cortex that control muscles of head and neck

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12
Q

path of corticonuclear fibers

A

pass through genu of IC, the crus cerebri of midbrain

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13
Q

what type of fibers do corticonuclear tracts have

A

motor and senosry

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14
Q

what are 2 components for corticospinal tract

A

lateral and anterior/.ventral

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15
Q

where do lateral corticospinal tract fibers cross

A

level of medulla

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16
Q

what do lateral corticopsinal tracts innervate

A

lateral neurons in ventral horn that control distal muscles

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17
Q

what is most of the fibers from corticospinal tract

A

in lateral corticospinal tract

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18
Q

where do anterior or ventral corticospinal tracts cross

A

in spinal cord just before synpasing on neurons/internors that control axial and prozimal limb muscles

19
Q

do all anterior or ventral corticospinal tracts cross

A

no

20
Q

generally what is lateral corticospinal tract necessary for

A

fractionation of movement

21
Q

fractionation of movement

A

ability to activate individual muscles independently of other muscles

22
Q

what happens to monkeys who have their corticospinal tracts cut at medullary pryamids

A

can’t grasp an object with 2 fibers

can walk/climb and don’t have spasticity

23
Q

what does anterior cerebral a supply

A

leg are of primary motor cortex, most of supplementary motor area, cingulate gyrus

24
Q

what does middle cerebral a supply

A

trunk, hand, face area of primary motor cortex, all of premotor area

25
Q

effect of lesion in primary motor cortex

A

weakness
persistent hypotonia
perment deficint in control o ffine, fractionated, finger movements

26
Q

what is mirror neuron system involved in

A

encoding intentions and actions of others, imitation learning

27
Q

where are mirror neurons found

A

premotor area

28
Q

function of supplementary motor area

A

planning/preparing for sequential motor acts, possible postural control

29
Q

what happens with unilateral SMA lesion in monkeys

A

unable to perform complex tasks requring both hands

30
Q

damage to input to SMA in parkinson’s causes what

A

problems initating movement

31
Q

lesion of supplementary motor complex in humans cause what

A

initiating or suppressing movement

32
Q

function of frontal eye field

A

voluntary and memory guided eye movements

33
Q

lesion to frontal eye field causes

A

premanent deficit in ability to make saccades not guided by external target
can’t volutnarily direct their eyes away from a stimulus in their visual field

34
Q

what is quadriplegia caused by

A

high cerivcal transections

35
Q

what is paraplegia caused by

A

transections below cervical level

36
Q

hemisection of spinal cord causes what

A

brown-sequard syndrome

37
Q

brain stem lesions causes

A

UMN hemiparesis contralteral to lesion

LMN w/ ipsilateral paralysis

38
Q

what are the 2 pathways to control eye movement via frontal eye field

A

superior colliculus and vertical /horizontal gase centers

39
Q

where does upper facial nerve nucleus get inforation from

A

both sides of cortex

40
Q

what happens if you get lesion of LMN on facial nerve nucleus

A

ipsilateral motor deficite

41
Q

what kind of projections does lower facial nerve nucleus get

A

contralateral

42
Q

sensory function of lateral corticospinal tract

A

facilitate/suppress transmission of afferent input to sensory relay nuclei
this could help focus attention on sensory input relevant to motor control

43
Q

motor function of lateral corticospinal tract

A

fine control of distal extremities, coarse regulation of proximal flexors

Physiology Exam VI (18 decks)

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