Blood supply to the brain Flashcards
How many arteries carry blood into the cranium?
4
Which four arteries carry blood into the cranium?
2x internal carotid
2x vertebral
Where do the vertebral arteries arise from?
Subclavian arteries
Where do the internal carotid arteries arise from?
Common carotid
What three arteries supply the spinal column?
1x anterior spinal artery
2x posterior spinal arteries
What arteries does the anterior spinal artery give off?
Intercostal arteries
Where does the anterior spinal artery terminate?
Both vertebral arteries
Where do the posterior spinal arteries terminate?
Their ipsilateral vertebral artery
In relation to the vertebrae where do the spinal arteries run?
In the vertebral foramen.
Where do the vertebral arteries flow?
Transverse process foramen
What do the vertebral arteries link to form?
Basilar artery
What does the basilar artery split into?
Posterior cerebral arteries
What artery comes off the posterior cerebral artery anteriorly?
Posterior communicating arteries
Where do the posterior communicating arteries link to?
Internal carotid/middle cerebral arteries
What is the first artery to come off the internal carotid?
Ophthalmic
What does the internal carotid artery become?
Middle cerebral artery
What links the two anterior cerebral arteries?
Anterior communicating artery
Where does the posterior cerebral artery supply?
Posterior aspect of cerebral hemisphere and visual cortexes.
Where does the middle cerebral artery supply?
Lateral aspect of cerebral hemisphere
Where does the anterior cerebral artery supply?
Medial aspect of cerebral hemisphere
What is the venous drainage of the spinal column?
Anterior and posterior internal vertebral venous plexus
Where is the circle of WIllis located?
Inferior to the midbrain, closely related to the pituitary stalk & the optic chiasm, within the subarachnoid space
What drains blood from the cerebral hemispheres?
Cerebral veins
Where do cerebral veins drain?
Duravenal sinuses
Where are the duravenal sinuses found?
Between a separation in the dura mater
Which is the biggest duravenal sinus?
Superior sagittal sinus
Where does the superior sagittal sinus run?
Longitudinally centrally superiorly
Where does the superior sagittal sinus drain into?
Confluence of sinuses
Where is the Confluence of sinuses?
Midline at the internal occipital protuberance
What two structures drain into the confluence of sinuses?
Superior sagittal sinus
Inferior sagittal sinus
Where does the confluence of sinuses drain?
Sigmoid sinuses -> jugulars
What is a major sinus located near the pituitary gland?
Cavernous sinus
What drains into the cavernous sinus?
Ophthalmic and facial veins
