The Human Brain Circulation

Much of our knowledge of the cerebral circulation has been derived from studies of species other than human. There is increas­ ing recognition of species differences and concern that studies in animals may be misleading if unquestioningly applied to the human. A dramatic example of this occurred in the early his­ tory of the study of the circulation of the brain. Galen of Pergamo (131-201 AD) described a rete mirabile or "marvelous network" of blood vessels at the base of the human skull that