Neurovasculature Flashcards
what are the two main divisions of neurovasculature
Carotid circulation
Vertebrobasilar circulation (aka vertebral-basilar system)
what does the brain need?
great deal of oxygen and glucose from the blood
4 major arteries supplying majority of CNS from heart
yes,
2 vertebrals
2 IC
why is it important to have 4 major supplies to the CNS from the heart?
important because if 1 or 2 gets occluded, can still get enough blood to brain to survive and do ok
can survive on 2 of them
ascends from the left ventricle of the heart
aorta
arise from the aorta and subclavian arteries
CC and vertebral arteries
anterior supply
carotid
posterior supply of blood to the head
vertebral
branch off from the subclavian arteries and provide about 20% of the blood supply to the CNS
vertebral arteries
blood supply brainstem, cerebellum, parts of the diencephalon, spinal cord, occipital and temporal lobes
vertebral
blood to brain, eyes, etc
internal carotid
blood to face and mouth
external carotid
~80% of the blood supply to the telencephalon and diencephalon
internal carotid arteries
supplies areas of the cerebellum, medulla and choroid plexus of the 4th ventricle
Posterior inferior cerebellar arteries
spinal cord (posterior side)
2
Posterior spinal arteries
anterior SC
single one
Anterior spinal artery
is one va larger than the other?
yes, the left is
supply inferior portion of cerebellum including the flocculus
Anterior inferior cerebellar arteries
supply superior cerebellum, much of the caudal midbrain and rostral pons
Superior cerebellar arteries (SiCA)
supply caudal diencephalon, medial occipital lobe and inferior temporal lobe
at the level of the midbrain—posterior cerebral arteries
arteries around to back of pons and Anterior Inferior Cerebellar a. to Cochlear Nuculeus
circumferential
supply SOC into pons tissue
Penetrating arteries
supply to Inferior Colliculus and some MGB at pons
Superior Cerebellar a. and Posterior Cerebral a
directly from basilar artery or from anterior inferior cerebellar artery
Internal auditory or labyrinthine arteries
Begins at upper border of the thyroid cartilage and ascends to reach the base of the skull
internal carotid
Enters at the carotid canal (aka lacerum)
internal carotid
what branches off of the IC and divides into the many branches
opthalamic artery
gives rise to middle cerebral arteries and anterior cerebral arteries, as well as posterior communicating arteries (More with Circle of Willis)
internal carotid
arises opposite the upper border of the thyroid cartilage, inclines backwards to space between the neck and condyle of the lower jaw and the external auditory meatus
external carotid
Divides into temporal and internal maxillary arteries
external carotid
Branches—supply the neck, face and base of skull
external carotid
what is our safety valve?
circle of willis