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CNS > [ANAT] MOTOR CORTEX > Flashcards

[ANAT] MOTOR CORTEX Flashcards

1
Q

area responsible for motor function

A

precentral area

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2
Q

area responsible for higher mental functions

A

prefrontal area

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3
Q

precentral area is present in?

A

posterior pt. of frontal lobe

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4
Q

parts of precentral area

A

Area 4- primary motor area
Area 6- premotor area
Area8- frontal eye field area
Area 44&45- Broca’s area

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5
Q

area 4 site

A

precentral gyrus
ant. paracentral lobule

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6
Q

body representation of area 4

A

contralateral
upside down
proportional to skill (depends on movement)

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7
Q

area 4 function

A

initiate + control discrete skilled movements

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8
Q

lesion of area 4 causes

A

contralateral hemiplegia of skilled movements

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9
Q

area 6 site

A

in front of area 4
sup, middle & inf frontal gyri
+extends on medial side of hemisphere

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10
Q

area 6 function

A

plans movements
stores plans of movements
adjusts posture
(-) msc tone & grasp reflex

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11
Q

lesion of area 6 causes

A

motor apraxia
spasticity
reappearance of grasp reflex

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12
Q

area 8 site

A

in front of area 6
sup & middle frontal gyri

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13
Q

area 8 function

A

voluntary conjugate eye movements

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14
Q

stimulation of area 8 leads to

A

contralateral deviation of both eyes

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15
Q

lesion of area 8 leads to

A

ipsilateral deviation of both eyes towards side of lesion
inability to turn eyes to opp direction

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16
Q

lesion of area 8 does NOT affect which reflex

A

Reflex conjugate eye movements (cont. by occipital eye field) why?

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17
Q

reflex conjugate eye movements are controlled by

A

occipital eye field

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18
Q

broca’s area site

A

pars triangularis & pars opecularis of inf frontal gyrus

19
Q

broca’s area is only present in

A

dominant hemisphere (usually left)

20
Q

broca’s area function

A

programs muscle contractions to produce words
project orders to area 4 for execution

21
Q

anterior speech area

A

broca’s area

22
Q

broca’s area receives sensory speech information from

A

Wernicke’s area

23
Q

lesion of broca’s area leads to

A

expressive aphasia

24
Q

expressive aphasia

A

patient can’t pronounce words easily but can perfectly understand them

25
Q

supplementary area site

A

medial frontal gyrus of medial hemisphere

26
Q

body representation of supplementary area

A

bilateral
head—>anterior
legs—–>posterior

27
Q

its stimulation evokes movements in both contralateral & ipsilateral limbs

A

supplementary motor area

28
Q

function of supplementary motor area

A

stores programmed motor sequences for stereotyped simple movements

29
Q

area containing superior speech center

A

supplementary motor area

30
Q

lesion of supplementary motor area

A

akinetic mutism

31
Q

akinetic mutism

A

inability to move + aphasia

31
Q

akinetic mutism

A

inability to move + aphasia

32
Q

prefrontal area site

A

remainder of sup, middle & inf frontal gyri
orbital gyri
most of medial frontal gyrus

33
Q

function of prefrontal area

A

intelligence
expressing emotions
predicting consequences
behavior
personality

34
Q

lesion of prefrontal area leads to

A

changes in behavior, mood, personality

35
Q

akinetic mutism is caused by

A

supplementary motor area lesion

36
Q

changes in behavior & personality is caused by lesion in

A

prefrontal area

37
Q

expression aphasia is caused by lesion in

A

broca’s area

38
Q

contralateral hemiplegia is caused by lesion in

A

area 4

39
Q

apraxia, spasticity & reappearance of grasp reflex are caused by lesion in

A

area 6

40
Q

ipsilateral deviation of both eyes + inability to move eyes to a certain side are caused by lesions in

A

area 8

41
Q

area responsible for inhibition of msc tone & grasp reflex

A

area 6

41
Q

area responsible for inhibition of msc tone & grasp reflex

A

area 6

CNS (29 decks)

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