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Library of Alexandria (Original)

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Raven
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« Reply #75 on: April 01, 2008, 01:32:42 pm »

Chronos

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   posted 12-21-2005 12:10 PM                       
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Amazing. It's been over a year since I last added to this. Time flies...

Galen

Claudius Galenus of Pergamum (131-201 AD), better known as Galen, was an ancient Greek physician. His views dominated European medicine for over a thousand years.

Life

Galen was born in Pergamum (modern-day Bergama, Turkey), the son of Nicon, a wealthy architect. His interests were eclectic - agriculture, architecture, astronomy, astrology, philosophy - until he concentrated on medicine.

By the age of twenty he had become a therapeutes ("attendant" or "associate") of the god Asclepius in the local temple for four years. After his father's death in 148 or 149 he left to study abroad. He studied in Smyrna and Corinth and at Alexandria. He studied medicine for a total of twelve years. When he returned to Pergamum in 157, he worked as a physician in a gladiator school for three or four years. During this time he gained experience of trauma and wound treatment. He later regarded wounds as "windows into the body".

From 162 he lived in Rome where he wrote extensively, lectured and publicly demonstrated his knowledge of anatomy. He gained a reputation as an experienced physician and his practice had widespread clientele. One of them was the consul Flavius Boethius who introduced him to the court where he became a court physician to Emperor Marcus Aurelius. Later he also treated Lucius Verus, Commodus and Septimius Severus. Reputedly he spoke mostly Greek, which was a more respected language of medicine than Latin at the time. He briefly returned to Pergamum during 166-169.

Galen spent the rest of his life in the Imperial court, writing and experimenting. He performed vivisections of numerous animals to study the function of the kidneys and the spinal cord. His favorite subject was the barbary ape. Reportedly he employed twenty scribes to write down his words. In 191, fire in the Temple of Peace destroyed some of his records. His exact date of death has traditionally been placed around the year 200, based on a reference from the 10th century Suda Lexicon. Some, however, have argued for dates as late as 216.

Work and impact

Galen transmitted Hippocratic medicine all the way to the Renaissance. His On the Elements According to Hippocrates describes the philosopher's system of four bodily humours, which were identified with the four classical elements. He created his own theories from those principles. In turn, he mainly ignored Latin writings of Celsus.

Amongst Galen's own major works is a seventeen-volume On the Usefulness of the Parts of the Human Body. He also wrote about philosophy and philology. His collected works total twenty-two volumes.

Galen's own theories, in accord with Plato's, emphasized purposeful creation by a single Creator ("Nature" - Greek phusis) - a major reason why later Christian and Muslim scholars could accept his views. His fundamental principle of life was pneuma (air, breath) that later writers connected with the soul. Pneuma physicon (animal spirit) in the brain took care of movement, perception, and senses. Pneuma zoticon (vital spirit) in the heart controlled blood and body temperature. "Natural spirit" in the liver handled nutrition and metabolism.

Galen expanded his knowledge partly by experimenting with live animals. One of his methods was to publicly dissect a living pig and cut its nerve bundles one at a time. Eventually he cut a laryngeal nerve (now also known as Galen's Nerve) and the pig stopped squealing. He tied the ureters of living animals to show that urine comes from the kidneys. He severed spinal cords to demonstrate paralysis.

From the modern viewpoint, Galen's theories were partially correct, partially flawed. He demonstrated that arteries carry blood, not air and made first studies about nerve functions, and the brain and heart. He also argued that the mind was in the brain, not in the heart as Aristotle had claimed.

However, much of Galen's understanding is flawed from the modern point of view. He did not recognize blood circulation and thought that venous and arterial systems were separate. This view did not change until William Harvey's work in the 17th century. Since most of his knowledge of anatomy was based on dissection of pigs, dogs, and Barbary apes, he also assumed that rete mirabile, a blood vessel plexus of ungulates, also existed in the human body. He also resisted the idea of tourniquets to stop bleeding and vigorously propagated blood letting as a treatment.

Galen's authority dominated medicine all the way to the 16th century. Experimenters' disciples did not bother to experiment and studies of physiology and anatomy stopped - Galen had already written about everything. Blood letting became a standard medical procedure. Vesalius presented the first serious challenge to his hegemony.

Much of medieval Islamic medicine drew on the works of the ancient Greeks, especially those elucidated by Galen, such as his expanded humoral theory. Most of Galen's Greek writings were first translated to the Syriac language by Nestorian monks in the university of Gundishapur, Persia. Muslim scholars primarily in Baghdad translated the Syriac manuscripts into Arabic, along with many other Greek classics. They became some of the main sources for Arabian scholars such as Avicenna, Rhazes, and Maimonides.

http://en.wikipedia.org/wiki/Galen

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