ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Brain blood supply. Coloured magnetic resonance (MRI) scan of a section through the brain showing the circle of Willis (red circle at centre). The circle of Willis is where the basilar and two carotid arteries serving the brain terminate and give rise to the anterior, middle and posterior cerebral arteries. The loop structure means that if one of the serving arteries is damaged blood supply to the brain is not stopped.
Model release not required. Property release not required.