Blood Supply Flashcards
Brain constitutes ___% body weight
2%
% Cardiac output requirement of brain
17%
Brain utilizes ___% of oxygen
20%
Cerebral blood flow
50 ml/100g brain tissue/ minute
Normal blood flow and mean oxygen consumption of average weight brain
750 ml / min
3.3 ml/100 g brain tissue per min
Origin of left common carotid
Aortic arch
Origin of right common carotid artery
Branch in bifurcation of brachiocephalic artery
At what level does the common carotid artery bifurcate
Thyroid cartilage
4 segments of ICA
Cervical
Intrapetrosal
Intracavernous
Cerebral (supraclinoid)
“Carotid siphon”
Intracavernous and cerebral portions of ICA
Begins as the artery emerges from the cavernous sinus and pass medial to anterior clinoid process
Cerebral segment of ICA
ICA segment extending from bifurcation of common carotid to carotid canal in petrous bone; has no branches
Cervical segment
ICA segment surrounded by dense bone
intrapetrosal segment
Major branches of ICA (3)
ophthalmic
posterior communicating
anterior choroidal
ophthalmic artery enters orbit through _____
optic foramen, ventral and lateral to the optic nerve
position ophthalmic artery in relation to CN II
ventral and lateral
arises from dorsal aspect of the carotid siphon and passes posteriorly and medially to join the PCA
PComm Artery
PComm Artery origin and course
arises from dorsal aspect of the carotid siphon and passes posteriorly and medially to join the PCA
usually arisis from the ICA distal to the PComm and passes backward across optic tract then laterally to enter the choroidal fissure in temporal lobe
anterior choroidal artery
Regarded as the direct communication of the ICA
MCA
where ICA divides to ACA and MCA
lateral to optic chiasm
Areas supplied by MCA and ACA
anterior 1/2 of thalamus basal ganglia corpus callosum most of the internal capsule medial and lateral surface of frontal and parietal lobes lateral surface of temporal lobe
origin of vertebral artery
first part of subclavian artery
