Vascular Supply Flashcards
How much of circulating blood does the Brian receive
20-25%
Brain small organ but
Over 10 billion neurons, weighs 3pounds
Comprises 2%of body mass overall
He much oxygen does it use
25 percent
Brain is completly dependent on blood supply
As there are no reserves
Lose consciousness after how long if no blood
10 seconds
Permanent brain damage after how long
2-3 minutes
Things that can disrupt vascular system
Clots Narrowing of arteries Elevated blood pressure Brain swell downward Also need vascular supply as well
Hypoxia
Lack of oxygen
Complete loss if oxygen
Anoxia
Path of blood supply
From heart to internal carotid arteries to circle of Willis
Where do heart muscles pump oxygenated blood
Into the aorta
Where does aorta send blood
To subclavian arteries (l and r)
Where does common carotid artery (l and r) arise from
From l and r subclavians
Where does common carotid artery l and r travel
Upward into the neck and subdivide again around the jaw
What does common carotid artery divide into
Internal and external carotid arteries (l and r)
Move in and thru the skull to the brain where it gets to the c of w
What do the external carotid arteries )l and r) serve
Outer surface of face
What do internal carotid arteries (land r) serve
The brain, they travel along the neck, upward, just behind the jaw
Where do internal carotid argues eventually merge
At the c of w
At the base if the brain, ready to beach into kore cerebral arteries
Where does blood move
From heart mover superiorly
Internal- c of w
Mainly provide for ant cerebral artery and middle cerebral artery
Pairs of cerebral artery
Ant pair, middle pair, post pair
Carotids =
Anterior and lateral
Path of blood
From heart to vertebral arteries to basilar to c of w
Heart muscles pump oxygenated blood into the
Aorta
Aorta sends blood to
Two subclavian arteries (l and r)
Subclavians branch into
Vertebral arteries (l and r)
Vertebral arteries travel upward along each side of the
Brainstem
Where do vertebral arteries join together
At the top of the brainstem (base of skull)
Once at brainstem vertebral arteries form 1 artery called
Basilar artery
Basilar artery
Supply posterior cerebral artery (pair) and cerebellar arteries (further back, branch off a little before c of w)
Basilar artery eventually merged at the c of w along with
Other Arteries ( from the internal carotid arteries (l and r))
Vertebrals path
Wind around and come up base of spinal cord- move superiorly along cervical verterbraes
Vertebrals= basilar =
Posterior
Internal Carotids give rise to
Anterior communicating artery
Ant comm art connects the
2 anterior cerebral arteries (ACA) and 2 middle cerebral arteries (MCA)
Posterior communicating artery
Extends back towards where the basilar artery joins the c of w
What has basilar artery been formed by
Two vertebrals
Basilar artery give rise to
Ant inferior cerebellar artery (AICA) and 2 posterior cerebral arteries (PCA)
Vertebral arteries give rise to
The posterior inferior cerebellar arteries. (PICA)
