(E1) 7 - Vasculature of the CNS Flashcards
Exam 1
What is the anterior circulation provided by? (of the brain)
Internal Carotid A.
What is the posterior circulation provided by? (of the brain)
Vertebral A.
What structures does the vertebral artery supply?
Describe the pathway of the Vertebral Artery
List and Describe the parts of the internal carotid and what it supplies there.
Ophthalmic artery
comes off just distal to______________
cavernous sinus
What are the branches of the Ophthalmic artery?
Central Artery of the Retina
Supraorbital and Supratrochlear A.
What parts of the brain does anterior circulation supply?
Frontal, parietal, and temporal lobes
What artery branches off of the internal carotid and supply parts of the anterior circulation?
Middle Cerebral arteries
What two arteries supply parts of the anterior circulation?
Anterior and Middle Cerebral Arteries
What is posterior circulation also referred to as?
Vertebrobasilar
What two arteries form the basilar artery?
Vertebral arteries
Where do the vertebral arteries supply blood?
Medulla
Cerebellum
Dura of post cranial fossa
Where do the basilar arteries supply blood?
Pons
Occipital Lobe
Temporal Lobe
Brainstem
Cerebellum
Branch and Supply for Posterior Cerebral Artery
What is the significance of the circle of Willis?
Anastomosis connecting anterior and posterior circulation
Anomalies are very common
What is the function of the Circle of Willis?
Provide an alternative route of blood flow if you have a blockage.
At the point of connection between the anterior cerebral A. and the internal carotid A.,
the lateral continuation of the ICA becomes the ________________
middle cerebral artery (MCA)
____________ connects anterior cerebral artery of both hemispheres
Anterior communicating artery
____________ connects the middle cerebral artery (IC) and posterior cerebral arteries
Posterior communicating artery
What are the spinal cord arteries?
- Anterior spinal artery
- Paired Posterior Spinal Arteries
Where does the anterior spinal artery run?
Anterior median fissure
Where do the posterior spinal arteries run?
On each side of the posterolateral sulcus
What do the posterior spinal arteries supply blood to?
Posterior columns
What do the anterior spinal arteries supply blood to?
Primary blood supply anterior 2/3
Ant and Post spinal arteries are joined by segmental branches
through the ___________
intervertebral foramen
_________ arteries (lumbar & intercostals) bifurcate into_______ branches that supply the nerve root
Segmental
radicular
Where do segmental arteries come off of?
Lumbar and Intercostals
Describe Ischemia )what it can lead to and type)
What is an infarction?
Tissue death due to long term ischemia
What is a transient ischemic attack?
- brief reduction in blood flow
- transient neurological signs (ministroke)
What is a hemorrhagic stroke?
Arterial rupture
