Int config of white matter Flashcards
what is it called above the corpus collosum
Corona radiata
what are the parts of the internal capsule
Ant limb
Genu (in middle)
Post limb
where is the ant limb found`
located bw head of caudate nucleus and lentiform nucleus
what fibre tracts does the ant limb have
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)
What fibre tract does the genu carry
primary cortex to IL motor nuclei of CNs (corticobulbar)
controls CL head
What tracts does the post limb carry
Thalamocortical- from motor nuclei of thalamus to primary somatosensory codex
Corticospinal- frontal lobe to ventral horn
What does each 3rd of the post limb control
ant- CL upper limb sensation + mvmt
middle- CL trunk sensation + mvmt
post- Cl lower limb sensation+ mvmt
Where is the temperooccipitopontine fibres found and what do they carry
occupy post section of post limb
Carry signals of intention of mvmt
Retrolenticular part of internal capsule function
Axons from lat geniculate body toward occipital lobe bilaterally
Sublenticular part of internal capsule function
From medial geniculate and travels to temporal lobe
what is found in the eternal capsul
Corticostriatal axon bundles from pre motor and primary motor cortex
What is found in the extreme capsule
bidirectional connection bw temporal and frontal lobes (ex. bw brooks and wernikes area)
what are the 5 commissural of the brain
corpus collosum ant commisure post commissure habenular commissure fornix
what does the forceps minor and major of the corpus collosum connect and what portion do they travel thru
minor- frontal lobe to frontal lobe (thru genu)
Major- connect occipital lobes (thru Selenium)
what do the medial and dorsal fibres of the ant commissure contribute to
medial- olfactory tract (connect r+l olfactory bulbs)
dorsal- Project to amyloid nucleus (for memory, emotion )
what crosses at the post commissure and what’s the function
Crossing fibres from pre tectal nucleus on way to edingar westphal nucleus
For consensual photo reflex
Function of the fornix
hippocampus to various structures of the cortex
part of limbic system
what are association fibres
Connect cortical areas within the same cerebral hemisphere
2 kinds- Short + long
What do short association fibres connect
Connection bw adjacent gyri
What are the 3 long association fibres
Sup longitudinal - connects temp, occipital and parietal to frontal lobe
Inf longitudinal bundle- connects occipital lobes
Unicanate fascicle- connects temporal lobe to frontal lobe
What branches of the middle cerebral artery are there and what does it supply
lenticulo striate arteries (6-12)
Supply striatum and post limb of int capsule
What branch does the ant cerebral artery give and what does it supply
recurrent artery of heubner
Supply ant 2/3 of cerebral hemishphere
Ant medial part of caudate nuc and ant limb of int capsule
what does the post cerebral artery supply
Supply thalamus and geniculate bodies
post 1/3 of cerebral hemisphere
What would a stroke of the middle cerebral artery affect and present as
Post limb of int capsule / genu
loss of voluntary motor and sensation control of CL lower face/tongue, Ul, trunk, LL
