Cerebral Arteries Flashcards
Any supply
Mostly any frontal lobe and corpus callousness
Two anterior Cerebral arteries ( l ACA and R ACA) supplies by
The internal Carotids
Location it ACA
Swoops posteriorly towards parieto-temporal-occipital area
Mohawk
Two middle cerebral arteries (L MCA and r MCA ) supplied by
The internal Carotids
MCA SUPPLY
Fan shaped distribution to most of lateral brain surface, temporal, parietal and post frontal lobe
Put hand on head when thinking
Two posterior cerebral arteries (L PCA AND R PCA) supplied by
The basilar (via the vertebrals)
What does it supply
Occipital lobe, lower temporal lobe
Hair on back of neck
Difficulty with facial processing
PCA
Motor planning and initiation affected
Ant/middle CA
Stroke closer to heart more damage
Diffuse, global distribution
Less damage. If into capillaries
Focal
Concentrated area of impairment
Broca’s is in. Frontal lobe but supplied by
MCA
Capillaries can extend past their area
True
MCA called the
Zone of language, encompass comprehension and expression
PCA area brain map
Temporal-face processing/memory of the inferior medial part if temporal
Prefrontal cortex can be fed by
Both ant and middle CA
Why have collateral supply
A system of blood supply to the brain in case of blockage
There is some overlap between the cerebral arteries as distribution spreads out to
Small vessels at the periphery
Blockages in supply at the periphery will have…
Less impact than blockage in supply elsewhere
Peripheral blockages (small vessels) may have some compensation from…
Collateral distribution
What is the blood brain barrier BBB
Selective permeability of capillaries, arteries
A astrocytes help form barrier
BBB restricts toxic substances from
Leaving the bloodstream and entering the brain tissue or extracellular fluid
BBB keeps most bacteria out but
Also keeps many helpful antibodies out
Allows good stuff in and some bad stuff out
Nexttt
Oxygen and glucose
Get in
Carbon dioxide
Get out
Some hormones
Get through
But BBB is permeable to
Alcohol l, some
Heavy metals, caffeine, nicotine
Effectiveness of meds dependent on how you get the meds to cross the
BBB
Sometimes gave to use glucose as Transport system
Tight junctions hard to get meds through