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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Endarterectomy

The term [endarterectomy] is composed by the prefix [end-] (sometimes used as [endo]), meaning "inner" or "internal"; the root term [-arter-], meaning "artery", and the suffix [-ectomy] meaning "removal" or "excision".

An endarterectomy is performed to remove atheromatous plaque that is causing arterial stenosis. Although every artery is a candidate for this procedure, carotid endarterectomy is one of the most frequently peripheral vascular procedures performed.

The plaque causing arterial stricture can be the origin of thrombi (in situ blood clots), or emboli (loose blood clots that travel with the flood of blood). These emboli can be the cause of cerebral transient ischemic attacks (TIA's).

In an endarterectomy the objective is to remove the inner layer of the vessel containing the atheroma. This layer is the tunica intima of the vessel. The problem when performing the procedure is to maintain perfusion of the brain which receives much of its blood supply trough the internal carotid artery. The brain also receives blood through the vertebral arteries and the contralateral internal carotid artery. All these vessels are interconnected at the base of the brain by the arterial circle of Willis, named after Thomas Willis (1621 - 1675)

For a YouTube video of the procedure: CLICK HERE (9 minutes)
For an image of the carotid plaque in situ: CLICK HERE 

 

Images property of: CAA.Inc. Artist: Dr. E. Miranda

Right carotid artery system - anterior view
Right carotid artery system - anterior view
Click on the image for a larger version
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