Where is the Location of the Circle of Willis?

Maintaining a healthy body is the prerequisite for normal life and work. However, due to factors such as environment, psychology, diet, and genetics, there are significant differences in physical fitness among individuals. Some people maintain good health habits, such as getting sufficient sleep and eating regularly, which keeps their bodies in a relatively healthy state. On the other hand, those who frequently stay up late and have irregular eating habits may experience decreased immunity and various health issues.

Many people are also interested in understanding the structure of their bodies, particularly the location of the cerebral arterial circle. Here is some information:

1. Location of the Cerebral Arterial Circle

The cerebral arterial circle, also known as the Willis circle, is located beneath the base of the brain and above the sella turcica. It surrounds the optic chiasm, gray commissure, and mamillary bodies and is formed by the anastomosis of the anterior communicating artery, the initial segments of the two anterior cerebral arteries, the terminal segments of the two internal carotid arteries, the posterior communicating arteries, and the initial segments of the two posterior cerebral arteries. This circle allows for communication between the bilateral internal carotid artery systems and the vertebral-basilar artery system.

Under normal conditions, the blood on both sides of the cerebral arterial circle does not mix but serves as a compensatory potential mechanism. When one of the arteries composing the circle is hypoplastic or blocked, blood redistribution and compensation can occur to some extent through the regulation of the circle, maintaining the nutritional and functional activities of the brain.

2. Function of the Cerebral Arterial Circle

The cerebral arterial circle consists of five components: the anterior communicating artery, the initial segments of the two anterior cerebral arteries, the terminal segments of the two internal carotid arteries, the posterior communicating arteries, and the initial segments of the two posterior cerebral arteries. If there are developmental issues or blockages in any of these arterial components, the circle can regulate and redistribute blood flow to maintain the nutritional and functional activities of the brain.

3. Abnormal Symptoms of the Cerebral Arterial Circle

The cerebral arterial circle is composed of multiple vascular tributaries at the base of the skull. When there is a blood supply obstacle in the cerebral arterial circle, patients may experience symptoms such as decreased vision, visual field defects, and eye movement disorders, apart from general manifestations. Therefore, if you experience vision problems, especially sudden vision loss, blurred vision, or severe eye fatigue, it is recommended to consult not only an ophthalmologist but also consider the possibility of intracranial lesions. It is essential to pay attention to neurological diseases and seek timely medical attention for any discomfort to identify and treat the condition.