The following matter needs to be addressed. In his seminal works on the circulus arteriosus in Cerebri Anatome in 1664 and De Anima Brutorum in 1672, Thomas Willis described the blood supply to the base of the brain in a number of animal species and, more importantly, founded the discipline of clinical neuroscience. The detailed comparative physiology and species differences between ovine and b...

Thomas Willis is considered one of the greatest neuroanatomists of all time. His name is usually associated with the circle of Willis, an anastomotic circle at the base of the brain, but his work also formed the foundation of basic neuroanatomical description and nomenclature, and comparative neuroanatomy. He was born on 27 January 1621 at Great Bedwyn in Wiltshire, England, the son of a farmer...

Two patients with the diagnosis of brain death were evaluated with computerized axial tomography (CAT). After intravenous infusion of 30% Conray there was no visualization of the intracranial vasculature (circle of Willis). The second patient also had an isoelectric EEG. A third patient with an intracerebral lesion similar to the other cases but without diagnosis of brain death, showed good vis...

one method of treating ruptured anterior communicating aneurysms is presented. this permits early clipping through a bifrontal flap. key branches of the circle of willis are temporarily occluded by special removable clips before exposing and permanently clipping the aneurysm. this requires the use of hypothermia at 28'0. and other technical aids described. the risk of a fatal recurrent hemorrha...

Background: Circulus Arteriosus cerebrii, another name for Circle of Willis, establishes a polygonal anastomotic channel between two internal carotid arteries and vertebral arteries. The arterial circle is located in the interpeduncular fossa, near base brain. It has been established through anatomical radiological studies that there are variations healthy persons. Aim: To evaluate Willis suppl...