Circulation Flashcards
The arterial blood supply of the cerebral cortex
The internal carotid and vertebral arteries supply the brain
- Circle of Willis connects the 2 supplies
Anterior circulation:
Internal carotid arteries (ICA’s):
- Ophthalmic artery
- Anterior choroidal artery
- Anterior cerebral artery (ACA)
- Middle cerebral artery (MCA)
Posterior circulation:
Vertebral arteries (VA)
- Anterior spinal artery
- Cerebellar arteries
- Unite to form Basilar artery
- Cerebellar arteries
- Posterior cerebral arteries (PCA’s)
Circle of Willis connects the 2 supplies - Anastomoses
interconnections between blood vessels
* If deficient in one supply, may get flow in one circulatory supply
Cerebral cortex supply
Anterior cerebral artery:
medial surface of the frontal & parietal lobes & narrow strip superiorly
• Middle cerebral artery: lateral surface of all lobes
• Posterior cerebral artery: medial & basal surfaces of occipital & temporal lobes
Integrate cerebral circulation with cerebral function
note: there are deep penetrating branches to the deeper subcortical structures
Different cerebrovascular accidents (CVA’s) produce different symptoms
The body is represented in the cortex according to the amount of innervation NOT the amount of mass
ischemia
educed supply of oxygenated blood in the brain
can have serious consequences for neuronal survival and cause major dysfunction.
What is the main movement that occurs at C1/2?
rotation
THE INTERNAL CAROTID ARTERIES AND BRANCHES:
posterior communicating artery
joins anterior & posterior circulations
THE INTERNAL CAROTID ARTERIES AND BRANCHES: anterior choroidal artery
travels posteriorly to supply the choroid plexus of the lateral ventricle, posterior limb internal capsule, hippocampus & tail of caudate nucleus
THE INTERNAL CAROTID ARTERIES AND BRANCHES: middle cerebral artery (MCA)
emerges as an almost direct continuation of the internal carotid artery and passes into the lateral sulcus
THE INTERNAL CAROTID ARTERIES AND BRANCHES:
anterior cerebral arteries (ACA)
branch off the internal carotid arteries in rostral-medial direction before they disappear in the longitudinal fissure; the anterior cerebral arteries are joined, just rostral to the optic chiasm by the anterior communicating artery.
The internal carotid artery
The eye (retina and optic nerve) receives blood via the internal carotid artery as the ophthalmic artery branches off the internal carotid at the level of the intracavernous segment.)
THE POSTERIOR “VERTEBROBASILAR” SYSTEM:
The 2 vertebral arteries enter the foramen magnum, ascend on the ventral aspect of the medulla & unite, at the pontomedullary junction, to form the basilar artery. The basilar artery ascends in the basilar groove of the pons & divides into 2 posterior cerebral arteries at the pons – midbrain junction. This system supplies blood to the brainstem, cerebellum and parts of the cortex and diencephalon.
