Galen

(ca. A.D. 130-200) Greek physician whose works were for centuries the Standards for anatomy and physiology. Though Galen gave good descriptions of some of the human body's different parts and their functions, his observations and conclusions on the circulation of the blood were far from correct. Even when more correct statements were put forward by other physicians, these were not accepted over Galen's observations for many years, but were' discarded as incorrect.