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Aristotle (384-322): He was born in Stagira to a wealthy family. His father, Nicomachus, was personal physician to Amyntas, king of Macedon. He probably learned quite a bit about medicine from his father before, starting when he was 17, spending 20 years being tutored by the great philosopher Plato at his academy in Athens. (6,
page 3)
He would spend about 20 years in Athens as a student, and then as a teacher. Some speculate he left after not being chosen as Plato's successor upon Plato's death in 347 B.C. Some speculate the reason Aristotle was not chosen, and why he left Athens, was because Aristotle was known to debate and disagree with Plato. He moved from Athens and continued his work elsewhere. (6, pages 3-5)
Regardless, he basically supported the same ideas regarding medicine as Plato. He believed in the four elements, qualities, and humors. He believed that a balance or imbalance of these determined health and sickness. (1)
While he believed in the elements of Empedocles, he attempted to add a fifth element that he called aether, a substance that made up what was seen in the sky at night, such as the stars, sun, planets, comets, etc. He was not the first to write about the elements and their qualities, although by the fame he acquired by being the instructor of Alexander the Great he was able to increase public awareness of them.
While he was not a physician, and is known mainly for his contributions to philosophy, he did make some significant contributions to medicine. Considering he was unable to dissect human beings, he spent most of his time at the dissecting table studying plants and animals. He was known for his faith in nature, claiming that "Nature does nothing uselessly." (5)
He stayed in A
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Erasistratus (304-250 B.C.) He was among the first Greek anatomists. He was the beneficiary of the new city, Alexandria, created by Alexander the Great. After Alexander died before he was 32 years old, Ptolomy decided to make Alexandria the leading place of wisdom and science in the world, so he gave the physicians at Alexandria permission to dissect human beings. Among these physicians was Erasistratus, who discovered and learned much about the inner workings of the human body. Some say he even went as far as to dissect living human beings, but all in the name of advancing science and wisdom.
He disregarded the idea the the four humors caused disease, and believed that diseases like pneumonia were caused by changes in the body, such as inflammation of the lungs. This is the type of wisdom that might have been expounded upon if it wasn't considered sacrosanct to dissect the human body in the ancient world.
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Herophilus (335-280 B.C.): He was the other leading physician at the school of Alexandria, and he likewise participated in dissection of the human body in a quest to improve wisdom and science. Unlike Erasistratus, he supported Hippocrates and his humoral ideas.
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Galen: He was born during the Roman Civilization, although he still lived in Greece. He lived in Pergamum, a city that was ruled by the Romans, but they still lived under Greek culture. Galen learned from all the above physicians, and he basically combined the works of all these great men, particularly combining the theories of Hippocrates with the anatomical discoveries of Erasistratus and Herophilus.
He believed in the humoral theories of health and sickness of Hippocrates. However, while Hippocrates was not concerned with anatomy of the body, Galen came up with theories of how each organ participated in the organisms life giving process.
Galen also believed in the Aristotelian idea that nature makes no flaws, and perhaps from him Galen obtained his belief that God created only perfect human beings, and therefore each part of the body had a perfect function.
Through his writings he described the faculties of nature, whereby each part of the body (veins, arteries, organs, etc.) performed a distinct function in order to maintain life, health and longevity.
He absorbed the idea of Plato of the power of three parts of the soul, although he referred to them as spirit.
- Natural Spirit: Formed in the liver and flowed through the body by veins to the various organs.
- Animal Spirit: Formed in the brain and responsible for sensation and intelligence
- Vital Spirit: Formed in the heart when air mixed with blood, and flowed through the arteries to the various organs. It consisted of passions.
He believed the person ingested food, the food was cooked in the stomach, turned into chyle, sent to the liver by veins, and turned into blood in the liver. The liver added natural spirit and nutrients to the blood, and sent it to the right ventricle of the heart to be purified. The blood was turned into a light, frothy substance so it could enter the lungs, and returned to the right ventricle of the heart as purified blood that ebbed and flowed through the entire system to provide natural spirit and nutrients to the body through the veins.
Some blood from the right ventricle was transferred to the left ventricle by invisible pores. This blood was mixed with air that was inhaled by the lungs. Since the heart was hot and controlled the temperature of the body, the cool air was needed to cool the heart. Air also contained pneuma, and so when the air and pneuma mixed with blood in the left ventricle, it formed vital spirit. This substance was responsible for the passions of the person, and was transferred through the body by the arterial system.
Some arterial blood went to the brain by vessels from the heart to the brain. Here this blood was mixed with animal spirit and sensations and intelligence. These were transported through the body by the various nerves.
His ideas of health and healing were similar to Hippocrates, although he believed changes that occur within one organ can effect the body as a whole. For example, asthma was caused by increased phlegm in the lungs, epilepsy was caused by increased phlegm in the brain, fever was caused by increased blood, etc.
His remedy was to treat contraries with contraries, or to treat whatever was the suspected cause with the opposite. If someone has too much phlegm, for example, Galen may with so have the patient drink an purgative or emetic to expectorate the excess phlegm.
Since Galen was the very last of the Greek and Roman physicians when Rome collapsed, and because he wrote so much about it, his works continued to be worshiped for greater than the next 1,500 years. Basically, Greek medicine survived the dark ages through the works of Galen.
During the Middle Ages the Catholic Church accepted the medical writings of Galen, perhaps because he believed that God created only perfect human beings. This fit into the Christian belief that god made no flaws. During this time, anyone who spoke out against the writings of Galen was greatly ridiculed, and sometimes severely punished, sometimes with death. (4, page 113)
So during the dark ages of medicine Galen became a god, of sorts, of medicine. His works were like the Bible to physicians. In this way, Greek medicine was the key, or the foundation of all medical knowledge. It would only be from using this key that any future advancements in medicine would be made.
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