ANATOMY- cerebrum (parietal lobe)

Question 1

anterior boundary of parietal lobe

Answer 1

central sulcus

Question 2

Inferior boundary of parietal lobe?

Answer 2

lateral sulcus

Question 3

posterior boundary of parietal lobe?

Answer 3

parieto occipital sulcus

Question 4

function of parietal lobe in dominant and non dominant hemisphere?

Answer 4

Dominant hemisphere= language + calculation
Non dominant hemisphere= 2 point sensation

Question 5

where is the primary somatosensory cortex found?

Answer 5

in the parietal lobe in the post central gyrus

poSt- Sensory

Question 6

function of primary somatosensory cortex?

Answer 6

-conscious awareness of somatic sensations
-fine and discriminative touch, proprioception, vibration

Question 7

if sensory info is felt on the right side of the body, which side of the brain will process this?

Answer 7

the left side (picks up sensations from the contralateral side of the body)

Question 8

what tracts send signals to the primary somatosensory cortex?

Answer 8

DCML
Spinothalamic/ anterolateral tract

(conscious ascending tracts)

Question 9

What sensations does the DCML sense?

Answer 9

-fine touch
-proprioception
-vibration

Question 10

what sensations does the spinothalamic touch sense?

Answer 10

-Pain
-temperature
-crude touch
-pressure

Question 11

what do the size of the body parts on the homunculus correlate to?

Answer 11

larger body part= increased sensitivity

Question 12

patient has right sided sensory loss in lower limbs + hip
Which side of the brain has been affected and which artery?

Answer 12

Left side of the brain
-ACA

Question 13

Where is the somatosensory association cortex found?

Answer 13

Posterior to the primary somatosensory cortex

Question 14

function of somatosensory association cortex?

Answer 14

-analyse, recognise and memory storage of somatic sensations
(E.g. even with your eyes shut you can remember what a pen feels like)

Signals come from primary somatosensory cortex and travel to somatosensory association cortex

Question 15

role of the posterior association cortex?

Answer 15

-spatial coordination
-It takes info from parietal (somatic sensation), occipital (visual sensation) and temporal (auditory sensation)

imagine dropping a glass on your foot, posterior association cortex is involved in this as you hear, see and feel it

Question 16

what are clinical signs of parietal lobe dysfunction?

Answer 16

-Visual field defect (congruous lower homonymous quadrantanopia)
- Sensory dysfunction (visual and sensory modalities in particular)
-Gerstmann’s syndrome (disease of the dominant angular gyrus, part of the inferior parietal lobe): Dysgraphia, left-right disorientation, finger agnosia, acalculia
-Dyspraxia
-Inattention (non-dominant angular gyrus)
-Denial