Quiz on Cerebral Arterial Anatomy of the Brain

Where is the Circle of Willis located?

• In the cerebellum

• In the spinal cord

• At the base of the brain around the optic chiasma

• At the top of the brain

What artery is located at the front boundary of the Circle of Willis?

• Posterior cerebral artery

• Internal carotid artery

• Anterior communicating artery

• Posterior communicating artery

What percentage of individuals have a complete Circle of Willis?

• 30-35%

• 10-15%

• 40-45%

• 20-25%

Which variant involves hypoplasia of one or both posterior communicating arteries?

• Fenestration

• Anterior cerebral artery hypoplasia

• Fetal PCA

• Hypoplasia of PCOM

What is the range of occurrence for hypoplastic or absent A1 segment of ACA?

• 5-10%

• 10-15%

• 15-20%

• 25-30%

What does the term 'fenestration' refer to in the context of cerebral arteries?

• A blockage in blood flow

• A type of aneurysm

• A normal anatomical variant

• A complete absence of an artery

What is a fetal PCA?

• A type of aneurysm

• A variant with absent or hypoplastic P1 segment

• A variant with a larger P1 segment

• A normal anatomical structure

What is the significance of the posterior communicating artery?

• It connects the anterior and posterior portions of the Circle of Willis

• It supplies blood to the spinal cord

• It is the largest artery in the brain

• It has no clinical significance

What anatomical variant involves the absence of the anterior cerebral artery?

• Hypoplasia

• Aplasia

• Fenestration

• Fetal PCA

What is the common occurrence of infundibular dilatation of the PCOM origin?

• 5-10%

• 10-15%

• 15-20%

• 20-25%