Medical Terminology Daily (MTD) is a blog sponsored by Clinical Anatomy Associates, Inc. as a service to the medical community. We post anatomical, medical or surgical terms, their meaning and usage, as well as biographical notes on anatomists, surgeons, and researchers through the ages. Be warned that some of the images used depict human anatomical specimens.

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A Moment in History

Jean-Louis Petit

Jean Louis Petit
(1674 – 1750)

French surgeon and anatomist, Jean Louis Petit was born in Paris in on March 13, 1674.  His family rented an apartment at his house to Alexis Littre (1658 – 1726), a French anatomist. Petit became an apprentice of Littre at seven years of age, helping him in the dissections for his lectures and at an early age became the assistant in charge of the anatomic amphitheater.

Because of Petit’s dedication to anatomy and medicine, in 1690 at the age of sixteen, became a disciple of a famous Paris surgeon, Castel.

In 1692, Petit entered the French army and performed surgery in two military campaigns. By 1693 he started delivering lectures and was accepted as a great surgeon, being invited to the most difficult operations.  In 1700 he was appointed Chief Surgeon of the Military School in Paris and in the same year he received the degree of Master of Surgery from the Faculty of Paris.

In 1715 he was made a member of the Royal Academy of Sciences and an honorary member of the Royal Society of London. He was appointed by the King as the first Director General of the Royal Academy of Surgery when it was founded in 1731.

Petit’s written works are of historical importance.  “Traite des Maladies des Os” ( A Treatise on Bone Diseases);  “Traite des Maladies Chirurgicales et des Operation” (A Treatise on Surgical Diseases and their Operations” This last book was published posthumously in 1774. He also published a monograph on hemorrhage, another on lachrymal fistula, and others.

He was one of the first to perform choIecystotomy and mastoidotomy. His original tourniquet design for amputations saved many in the battlefield and the design of the same surgical instrument today has not changed much since its invention by him.

His name is remembered in the lumbar triangle, also called the "triangle of Petit", and the abdominal hernia that can ensue through that area of weakness, the lumbar hernia or "Petit's hernia".

Sources:
1. “Jean Louis Petit – A Sketch of his Life, Character, and Writings” Hayne, AP San Fran Western Lancet 1875 4: 446-454
2. “Oeuvres compl?tes de Jean-Louis Petit” 1837 Imprimerie de F. Chapoulaud
3. Extraits de l'eloge de Jean-Louis Petit Ius dans Ia seance publique de I' Academie royale de chirurgie du 26 mai 1750” Louis A. Chirurgie 2001: 126 : 475- 81


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Franz Anton Mesmer


This article is part of the series "A Moment in History" where we honor those who have contributed to the growth of medical knowledge in the areas of anatomy, medicine, surgery, and medical research.To search all the articles in this series, click here.
Franz Anton Mesmer (1734 - 1815). A German physician, he was also known as Friedrich Anton Mesmer. He studied medicine at the University of Vienna; for his thesis, he developed the theory of “animal magnetism,” based on the works of Newton and gravity and his studies of astrology and the influence of magnetic fields on objects. His 1776 dissertation was titled “De Planetary Influxu” (On the Influence of the Planets)

After 10 years of a normal medical practice (for the times) Mesmer grew ever so impatient with the “classic” potions, salves, and bloodletting. He treated a woman of what today would be called “hysteria” or “somatization disorder” with every known medical treatment unsuccessfully; she improved after a treatment with magnets! leading Mesmer to believe that “animal magnetism” was the way to continue his career.

Mesmer developed a pseudotechnique to “magnetize” almost every element except steel, and his patient base grew. These patients all had some type of mental disorder that was susceptible to treatment by suggestion. Mesmer had discovered what today we know as the “placebo effect” and the basics of therapeutic hypnosis. Mesmer had so many patients that he had to treat them in “batches”, several at a time. Patients who were treated by Mesmer were said to have been “Mesmerized”.

Franz Anton Mesmer

Mesmer came under attack by the scientific establishment and when he could not prove his theories he was discredited. The fact that Mesmer used theatrics to further influence his suggestive patients did not help and he was labeled a “quack”. Mesmer retired a rich man to Switzerland where he died in 1815.

Sources:

1. "Franz Anton Mesmer and the Rise and Fallof Animal Magnetism: Dramatic Cures,Controversy, and Ultimately a Triumph for the Scientific Method"Lanska DJ, Lanska JT Brain, Mind and Medicine: Essays in Eighteenth-Century Neuroscience, 2007
2. "Early American mesmeric societies: a historical study" Gravitz, MA Am J Clin Hypn (1994) 37, 41–48
3. "Franz Anton Mesmer: The first psychotherapist of the modern age?" Traetta, L (2008) Int J Psychol 43 (3-4) 121

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