[ANAT] MOTOR CORTEX

Question 1

area responsible for motor function

Answer 1

precentral area

Question 2

area responsible for higher mental functions

Answer 2

prefrontal area

Question 3

precentral area is present in?

Answer 3

posterior pt. of frontal lobe

Question 4

parts of precentral area

Answer 4

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

Question 5

area 4 site

Answer 5

precentral gyrus
ant. paracentral lobule

Question 6

body representation of area 4

Answer 6

contralateral
upside down
proportional to skill (depends on movement)

Question 7

area 4 function

Answer 7

initiate + control discrete skilled movements

Question 8

lesion of area 4 causes

Answer 8

contralateral hemiplegia of skilled movements

Question 9

area 6 site

Answer 9

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

Question 10

area 6 function

Answer 10

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

Question 11

lesion of area 6 causes

Answer 11

motor apraxia
spasticity
reappearance of grasp reflex

Question 12

area 8 site

Answer 12

in front of area 6
sup & middle frontal gyri

Question 13

area 8 function

Answer 13

voluntary conjugate eye movements

Question 14

stimulation of area 8 leads to

Answer 14

contralateral deviation of both eyes

Question 15

lesion of area 8 leads to

Answer 15

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

Question 16

lesion of area 8 does NOT affect which reflex

Answer 16

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

Question 17

reflex conjugate eye movements are controlled by

Answer 17

occipital eye field

Question 18

broca’s area site

Answer 18

pars triangularis & pars opecularis of inf frontal gyrus

Question 19

broca’s area is only present in

Answer 19

dominant hemisphere (usually left)

Question 20

broca’s area function

Answer 20

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

Question 21

anterior speech area

Answer 21

broca’s area

Question 22

broca’s area receives sensory speech information from

Answer 22

Wernicke’s area

Question 23

lesion of broca’s area leads to

Answer 23

expressive aphasia

Question 24

expressive aphasia

Answer 24

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

Question 25

supplementary area site

Answer 25

medial frontal gyrus of medial hemisphere

Question 26

body representation of supplementary area

Answer 26

bilateral head--->anterior legs----->posterior

Question 27

its stimulation evokes movements in both contralateral & ipsilateral limbs

Answer 27

supplementary motor area

Question 28

function of supplementary motor area

Answer 28

stores programmed motor sequences for stereotyped simple movements

Question 29

area containing superior speech center

Answer 29

supplementary motor area

Question 30

lesion of supplementary motor area

Answer 30

akinetic mutism

Question 31

akinetic mutism

Answer 31

inability to move + aphasia

Question 31

akinetic mutism

Answer 31

inability to move + aphasia

Question 32

prefrontal area site

Answer 32

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

Question 33

function of prefrontal area

Answer 33

intelligence expressing emotions predicting consequences behavior personality

Question 34

lesion of prefrontal area leads to

Answer 34

changes in behavior, mood, personality

Question 35

akinetic mutism is caused by

Answer 35

supplementary motor area lesion

Question 36

changes in behavior & personality is caused by lesion in

Answer 36

prefrontal area

Question 37

expression aphasia is caused by lesion in

Answer 37

broca's area

Question 38

contralateral hemiplegia is caused by lesion in

Answer 38

area 4

Question 39

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

Answer 39

area 6

Question 40

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

Answer 40

area 8

Question 41

area responsible for inhibition of msc tone & grasp reflex

Answer 41

area 6

Question 41

area responsible for inhibition of msc tone & grasp reflex

Answer 41

area 6