Flashcards in Regional Blood Flow Deck (24)
The CNS utilizes approximately ______ of the cardiac output (850 ml/min) and burns approximately _________; therefore, any alterations may severely affect the proper function of the brain and spinal cord, or prove fatal.
3.3 ml O2
Changes in blood circulation occur as ________________ accidents (CVA; strokes). Strokes can occur in large major supply vessels, or MORE commonly in _______________________.
small penetrating vessels
Therefore, it is important to understand the general scheme of the blood supply to the entire CNS as well as some of the smaller specific blood supplies. Strokes are of clinical significance and the symptoms and signs manifested after a stroke depend upon the:
Major arterial supply to the brain is derived from the two _________________ and from the _________________ system. These two systems anastomose (become continuous with each other) around the base of the brain as the Anastomotic ___________________.
Circle of Willis
Vessels involved in the Circle of Willis are (name 5):
1. Anterior cerebral arteries
2. Anterior communicating artery
3. Internal carotid arteries
4. posterior communicating arteries
5. posterior cerebral arteries
This continuous (anastomotic) system is variable and thus does not always allow for ______________________ of blood flow.
adequate alternate paths
The internal carotid system includes the following arteries:
1. anterior choroidal artery
2. posterior communicating artery
3. middle cerebral artery
4. anterior cerebral artery
5. striatal (ganglionic or central) arteries
anterior choroidal artery -
associated with choroid plexus; temporal lobe.
posterior communicating artery -
posterolateral ganglionic arteries for thalamus and basal ganglia.
middle cerebral artery -
blood supply to the lateral surface of the cerebral hemispheres.
anterior cerebral artery -
blood supply to the medial surface of the cerebral hemispheres, rostral to the parieto-occipital sulcus.
striatal (ganglionic or central) arteries
- penetrating arteries that supply the subcortical structures; basal ganglia, diencephalon, subcortical white matter.
The vertebral-basilar system is made up the following arteries:
1. vertebral artery
2. anterior spinal artery
3. posterior spinal artery
4. posterior inferior cerebellar artery (PICA)
5. anterior inferior cerebellar artery (AICA)
6. superior cerebellar artery
7. basilar artery
8. posterior cerebral artery
vertebral artery -
anterior spinal artery -
blood supply to anteromedial medulla, anterior spinal cord.
posterior spinal artery -
blood supply to posterior and caudal medulla, posterior spinal cord.
posterior inferior cerebellar artery (PICA) -
blood supply to cerebellum and lateral part of medulla.
anterior inferior cerebellar artery (AICA) -
pontine tegmentum and cerebellum.
superior cerebellar artery -
dorsal midbrain, cerebellar cortex and deep nuclei.
basilar artery -
supply pons, cerebral peduncles.
posterior cerebral artery -
blood supply to midbrain, ventral and medial parts of the cerebral hemispheres.
The notable veins are:
1. great vein of Galen
2. cerebral veins
3. dural veins
great vein of galen =
empties into straight sinus; drains subcortical structures