Parietal Lobe Flashcards
(13 cards)
Parietal lobe extent
It is situated above sylvian fissure
Behind central sulcus
In front of parieto occipital sulcus
What Structure divides parietal lobe into anterior and posterior parietal lobules?
Post central sulcus
Before post central sulcus primary sensory cortex present
After post central sulcus posterior parietal lobules present
Primary sensory cortex extent
Also called as post cental gyrus
From central sulcus to post central sulcus
Broadman number for primary sensory cortex
3,1,2
How much percentage of motor fibres originate from primary sensory cortex ?
40%
Blood supply of primary sensory cortex
Middle cerebral artery
This artery supplies blood to both primary motor and sensory cortex
If both the regions affected then c/l umn weakness and cortical sensations are affected
What are the cortical sensations ?
Tactile localisation
Two point discrimination
Steriognosis
Graphesthesia
Why tone is not affected in primary sensory cortex lesion?
Tone are basically governed by premotor and supplementary motor area
Posterior parietal lobule is divided into ?
It is divided into superior and inferior parietal lobules by intra parietal sulcus
Function of superior parietal lobule
Sensory guidance for movement
What is apraxia?
Inability to perform fine, skilled, voluntary movements inspite of normal:
1) Motor and sensory function
2) Cerebellum
3) Comprehension
Broad Types of apraxia
Ideational apraxia (idea itself is absent)
Ideomotor apraxia (idea present but execution poor)
Two important areas of inferior parietal lobule
Supramarginal gyrus
Angular gyrus
