Circulus arteriosus is formed by
Circulus arteriosus or "circle of Willis" is a anatomical peculiarity of cerebral arteries.
It is formed by
• Anteriorly by anterior communicating artery.
• Posteriorly by basilar artery.
• On each side by anterior cerebral, posterior cerebral, posterior communicating and internal carotid arteries.
Anterior communicating artery.
Basilar artery.
Anterior, posterior cerebral and posterior communicating artery.
All of the above.
All of the above.