Circulation Flashcards
Inflows to Circle of Willis
Internal Carotid - Anterior Circulation
Vertebral Basilar system - Posterior Circulation
Circle of Willis supplies
hemishperes, IC, base of brain, optic chiasm, cerebellum, brain stem
MCA
middle cerebral artery
most common location for stroke
UE is most affected with MCA stroke
MCA branches
superior - above lateral fissure
inferior - below lateral fissure
striate arteries - to striatum (BG) and PLIC
ACA
anterior cerebral artery
comes off of internal carotid and MCA
perfuses medial surface of hemispheres (LEs)
- rare blockage
PCA
Posterior Cerebral Artery
continuation of Vertebral Basilar System
Perfuses midbrain
primarily perfuses occipital lobe (visual) and inferior temporal lobe, thalamus and PLIC
Posterior Communicating
connects the PCA and MCA
perfuses the midbrain
Superior Cerebrallar A (SCA)
off of basilar
perfuses midbrain and cerebellum
Pontine Branches
pons (smallest vessels to largest portion of brain) but many branches
AICA (ant. inf. cerebellar A)
to pontomedullar junction (lower pons/ medial medulla) and then onto the cerebellum
PICA (post. inf. cerebellar A)
Off of vertebrals
lateral medulla perfusion
onto cerebellum
ASA (anterior spinal)
runs down the front of the SC
gets BF from vertebrals and/or aorta
perfuse ventral column and ventral part of lateral column
PSA
2 that come from PICA or vertebral
get blood supply off vertebral in cervical region and/or aorta once in thoracic area
perfuse dorsal columns and dorsal part of lateral columns
lower cord stays alive via this perfusion
extra reflex activity bc isolated section of cord is still alive just cut off from above
Radiculospinal A
weak contributions to upper L and upper T region
adds BF to vertebrals
not very large
ASA and PSA boulstered by:
radicular A
radiculospinal A
