1. Anatomy:
– The circle of Willis is an anastomotic arterial ring located at the base of the brain.
– It connects the four main arteries that supply the brain:
- Two vertebral arteries
- Two internal carotid arteries
This circular arrangement provides a failsafe system against ischemia (reduced blood flow) in case of single vessel occlusion.
2. Function and Significance:
– The circle of Willis allows proper blood flow from the arteries to both the frontal and occipital hemispheres of the brain.
– It ensures collateral circulation, protecting against interruptions due to blocked or narrowed arteries.
– Named after English physician Thomas Willis, it acts as a vital safety net for brain perfusion.
References:
(1) Circle of Willis – Structure – Location – TeachMeAnatomy. https://teachmeanatomy.info/encyclopaedia/c/circle-of-willis/.
(2) Circle of Willis: Anatomy, Function, and Significance – Verywell Health. https://www.verywellhealth.com/circle-of-willis-anatomy-function-and-significance-4686318.
(3) Circle of Willis: Anatomy, function, and what to know – Medical News Today. https://www.medicalnewstoday.com/articles/circle-of-willis.
(4) Circle of willis | PPT – SlideShare. https://www.slideshare.net/slideshow/circle-of-willis/235461966.
Verified by Dr. Petya Stefanova
