What are the vascular territories of the intracranial arteries?
Superior cerebellar artery (SCA) whole superior surface of the cerebellar hemispheres down to the great horizontal fissure. the superior vermis. dentate nucleus. most of the cerebellar white matter.
What is vascular territory?
The territory of the anterior choroidal artery encompasses part of the hippocampus, the posterior limb of the internal capsule and extends upwards to an area lateral to the posterior part of the cella media. The whole area is rarely involved in AChA infarcts.
What is cerebral artery territory?
Posterior cerebral artery The vascular territory of the PCA is depicted in blue. The P1 segment extends from the PCA origin to the posterior communicating artery, contributing to the circle of Willis. Posterior thalamoperforating arteries branch off the P1 segment to supply blood to the midbrain and thalamus.
What part of the brain does the anterior cerebral artery supply?
To summarize, the ACA supplies the medial and superior parts of the frontal lobe, and the anterior parietal lobe.
What is artery of Percheron?
The artery of Percheron (AOP) is an anatomic variant of the blood vessels supplying the thalamus that has been observed in up to one third of human brains . Occlusion of the AOP is one of the few single-artery pathologies that can affect bilateral structures.
Is the middle cerebral artery part of the circle of Willis?
The MCA is part of the circle of Willis anastomotic system within the brain, which forms when the anterior cerebral arteries anastomose anteriorly with each other through the anterior communicating artery and posteriorly with the two posterior communicating arteries bridging the MCA with the posterior cerebral artery …
What is Circle Willis?
Overview. The Circle of Willis is the joining area of several arteries at the bottom (inferior) side of the brain. At the Circle of Willis, the internal carotid arteries branch into smaller arteries that supply oxygenated blood to over 80% of the cerebrum.
What happens if anterior cerebral artery is blocked?
Anterior cerebral arteries supply blood to the frontal lobes’ anterior (front) aspects, areas responsible for higher-level cognition, including judgment and reasoning. Blockages of these arteries can result in cerebral dementia and speech difficulties.
What is a Percheron stroke?
Artery of Percheron (AOP) is an abnormal variant of the arterial supply of the thalamus. AOP occlusion can lead to bilateral thalamic and rostral midbrain infarct presenting as memory loss, fluctuating levels of consciousness, and altered mental status.
What do we know about normal variants of the circle of Willis?
Variations of the cerebral circulation, in particular of the circle of Willis, are common. When assessing CT angiograms of the cerebral circulation, it is important to understand the appearance of these normal variants, their prevalence, and their clinical relevance, particularly with respect to the risk of aneurysm formation.
Which MR imaging findings are characteristic of perianal fistula?
Characteristic MR imaging findings are obtained for perianal fistulas and abscesses with the different sequences of the protocol described in the Table. Unenhanced T1-weighted images provide an excellent anatomic overview of the sphincter complex, levator plate, and ischiorectal fossa.
What are the classification systems for perianal fistulas?
There are two main classification systems for perianal fistulas: the Parks classification and the St James’s University Hospital classification.
How are fistulas classified based on Axial MR images?
These descriptions correspond exactly with the view of the anal canal on axial MR images obtained with the patient in the decubitus supine position. Fistulas may be classified according to the route taken by the main track running from the anal canal to the skin.