Int config of white matter

Question 1

what is it called above the corpus collosum

Answer 1

Corona radiata

Question 2

what are the parts of the internal capsule

Answer 2

Ant limb
Genu (in middle)
Post limb

Question 3

where is the ant limb found`

Answer 3

located bw head of caudate nucleus and lentiform nucleus

Question 4

what fibre tracts does the ant limb have

Answer 4

Thalamiccortico (asceding)- From motor nuc of thalamus to primary motor cortex

Frontopontine (descending)- from pre and primary motor cortex to pontine nuclei (carrying info to cerebellum)

Question 5

What fibre tract does the genu carry

Answer 5

primary cortex to IL motor nuclei of CNs (corticobulbar)

controls CL head

Question 6

What tracts does the post limb carry

Answer 6

Thalamocortical- from motor nuclei of thalamus to primary somatosensory codex

Corticospinal- frontal lobe to ventral horn

Question 7

What does each 3rd of the post limb control

Answer 7

ant- CL upper limb sensation + mvmt

middle- CL trunk sensation + mvmt

post- Cl lower limb sensation+ mvmt

Question 8

Where is the temperooccipitopontine fibres found and what do they carry

Answer 8

occupy post section of post limb

Carry signals of intention of mvmt

Question 9

Retrolenticular part of internal capsule function

Answer 9

Axons from lat geniculate body toward occipital lobe bilaterally

Question 10

Sublenticular part of internal capsule function

Answer 10

From medial geniculate and travels to temporal lobe

Question 11

what is found in the eternal capsul

Answer 11

Corticostriatal axon bundles from pre motor and primary motor cortex

Question 12

What is found in the extreme capsule

Answer 12

bidirectional connection bw temporal and frontal lobes (ex. bw brooks and wernikes area)

Question 13

what are the 5 commissural of the brain

Answer 13

corpus collosum
ant commisure
post commissure
habenular commissure
fornix

Question 14

what does the forceps minor and major of the corpus collosum connect and what portion do they travel thru

Answer 14

minor- frontal lobe to frontal lobe (thru genu)

Major- connect occipital lobes (thru Selenium)

Question 15

what do the medial and dorsal fibres of the ant commissure contribute to

Answer 15

medial- olfactory tract (connect r+l olfactory bulbs)

dorsal- Project to amyloid nucleus (for memory, emotion )

Question 16

what crosses at the post commissure and what’s the function

Answer 16

Crossing fibres from pre tectal nucleus on way to edingar westphal nucleus

For consensual photo reflex

Question 17

Function of the fornix

Answer 17

hippocampus to various structures of the cortex

part of limbic system

Question 18

what are association fibres

Answer 18

Connect cortical areas within the same cerebral hemisphere

2 kinds- Short + long

Question 19

What do short association fibres connect

Answer 19

Connection bw adjacent gyri

Question 20

What are the 3 long association fibres

Answer 20

Sup longitudinal - connects temp, occipital and parietal to frontal lobe

Inf longitudinal bundle- connects occipital lobes

Unicanate fascicle- connects temporal lobe to frontal lobe

Question 21

What branches of the middle cerebral artery are there and what does it supply

Answer 21

lenticulo striate arteries (6-12)

Supply striatum and post limb of int capsule

Question 22

What branch does the ant cerebral artery give and what does it supply

Answer 22

recurrent artery of heubner

Supply ant 2/3 of cerebral hemishphere

Ant medial part of caudate nuc and ant limb of int capsule

Question 23

what does the post cerebral artery supply

Answer 23

Supply thalamus and geniculate bodies

post 1/3 of cerebral hemisphere

Question 24

What would a stroke of the middle cerebral artery affect and present as

Answer 24

Post limb of int capsule / genu

loss of voluntary motor and sensation control of CL lower face/tongue, Ul, trunk, LL