Herophilus a Greek physician who lived during the late fourth and early third centuries B.C. He made many significant discoveries while performing human dissections and is regarded as the founder of the science of anatomy. He determined the functions of nerves and made important discoveries relating to the brain, eye, circulatory system, and reproductive organs. What little that is known of the life and work of Herophilus has come from another Greek physician, Galen (130?–201? A.D.). He says that Herophilus came from Chalcedon in Asia Minor and taught and practiced in Alexandria, Egypt. With the physician Erasistratus and other scholars he helped make the city a center of learning.