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  Medical theory was based on the Greek concept of the the four concepts earth, air, fire, and water.
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  Discovered difference between small pox and measles
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  Ammar ibn 'ali al-mawsili preformed first successful surgery to remove cataract.
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  First hospital to be documented was in 1084 England, Canterbury.
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  Ibn an-Nafis suggest that the right and left ventricles of the heart are separate and discovers the pulmonary circulation and culinary circulation
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  Leonardo da Vinci dissects corpses
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  Publishes An Anatomical Study of the Motion of the Heart and of the Blood in Animals
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  Sir Christopher Wren experiments with canine blood transfusion
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  Anton Van Leeuwenhoek discovers blood cells
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  Bacteria was first observed with a microscope beginning the field of microbiology.
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  Claudius Aymand performs first successful appendectomy.
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  Invents the stethoscope.
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  James Blundell preforms the first successful transfusion on human blood
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  Dr. Horace Wells uses nitrous oxide as an anesthetic
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  First women to receive a medical degree
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  First to treat diabetes.
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  First vaccine of diphtheria
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  First vaccine for pertussis (whooping cough).
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  Performs the first kidney transplant between identical twins.
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  Preformed first human heart transplant