Praxagoras

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Not to be confused with Praxagoras of Athens.

Praxagoras (

Ancient Greek: Πραξαγόρας ὁ Κῷος) was a figure of medicine in ancient Greece. He was born on the Greek island of Kos in about 340 BC. Both his father, Nicarchus
, and his grandfather were physicians. Very little is known of Praxagoras' personal life, and none of his writings have survived.

History

Between the death of Hippocrates in 375 BC and the founding of the school in Alexandria, Egypt, Greek medicine became entrenched with speculation, seeing little advances in medicine. During this period four men took up the study of anatomy: Diocles of Carystus (fl. 4th century BC), Herophilos (c. 335–280 BC), Erasistratus (c. 304–250 BC), and finally Praxagoras.

Galen (AD 129–216), a famous Greek physician, wrote of Praxagoras as this influential figure in Greek medicine and a member of the logical or Dogmatic school. Galen also probably knew of the works of Praxagoras, writing on natural sciences, anatomy, causes and treatment of disease, and on acute diseases.

Praxagoras adopted a variation of the

four humors (blood, phlegm, yellow bile, and black bile) that most physicians held, he insisted on eleven. Like the other Greek physicians, he believed health and disease were controlled by the balance or imbalance of these humors. For example, if the proper amount of heat is present in the organism, the process of digestion is natural. Too little or too much heat will cause a rise in the other humors, which then produces certain disease conditions. He considered digestion to be a kind of putrefaction
or decomposition, an idea that was held until the 19th century.

Praxagoras was also influential in the Alexandrian school in particular. After the death of Alexander the Great (356–323 BC), Egypt fell to the hands of General Ptolemy, who established a modern university with the first great medical school of antiquity. Human dissection was practiced, mostly by Herophilos and Erasistratus; Praxagoras was Herophilos' teacher. Although the university in Alexandria and its massive library was destroyed by bands of conquerors, later Arabic physicians made the efforts to preserve some of the writings. After the fall of the Byzantine Empire, Greek scholars brought back Greek medicine to the medical schools of the Western Renaissance.

Praxagoras' theory of circulation

Praxagoras studied

arteries were the channels through which voluntary motion was given to the body, and that the cause of epilepsy was the blocking of the aorta by this same accumulation of phlegm
.

Aristotle, Diocles, and Praxogoras insisted that the heart was the central organ of intelligence and the seat of thought. Praxagoras differed with the others in that he believed the purpose of respiration was to provide nourishment for the psychic pneuma, rather than to cool the inner heat.

Arteries and pulse

Praxagoras' views on arteries were very influential in the development of physiology. Since the concept of

motor
nerves.

Praxagoras was interested in pulse and was the first to direct attention to the importance of arterial pulse in diagnosis. He insisted that arteries pulsed by themselves and were independent of the heart. Herophilus refuted this doctrine in his treatise "On Pulses." In another area, Galen criticized Praxagoras for displaying too little care in anatomy. He suggested that Praxagoras did not arrive at his theories by dissection.

The beliefs of Praxagoras held sway for centuries. For example, for nearly 500 years after his death, many still believed that arteries did not contain blood but pneuma. His most famous pupil, Herophilos, was instrumental in establishing the marvelous medical establishment at Alexandria.

See also

References

  1. ISBN 0-683-30556-5

Vivian Nutton, "Ancient Medicine" New York: Routledge, 2004.

External links
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