4h 47min, apr 20, 114 y - Galen studies health.
Description:
He was a Greek surgeon who studied the body. Galen described the valves of the heart and noted differences between arteries and veins. For centuries, doctors based their ideas on Galen's teachings.Added to timeline:
Date:
4h 47min, apr 20, 114 y
Now
~ 1912 years ago