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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The lost influence of Andreas Vesalius on eponymic anatomy

Andreas Vesalius Bruxellensis (1515-1564) is considered to be the father of modern anatomy, remembered because an illustrious life and by his book “De Humani Corporis Fabrica, Libri Septem” published first in 1543. Scores of books, translations, articles, and analyzes of his work have been published in the over 500 years since his birth.

With such an incredible pedigree we would expect his name to be attached to more than a few anatomical structures, many of which were first described in his opus magnus, the “Fabrica”, I wonder why this is not so. It is true that modern anatomy is trying to move from eponyms to more descriptive anatomical terms. Still, there are many that will not go away, as is the famous ligament of Treitz, or the sphincter or Oddi.

Today there is only one recorded eponym for Andreas Vesalius, the os vesalianum, a rare accessory bone in the foot located proximally to the base of the fifth metatarsal. It is usually asymptomatic, but in rare cases it can cause pain. It is formed by the failed fusion of the secondary ossification center of the fifth metatarsal.

Reviewing history, I was able to find other references to Andreas Vesalius eponyms or potential eponyms, now in disuse or misnamed:

Andreas Vesalius Bruxellensis
Suspensory ligaments of the mammary gland. Although first described by Vesalius in the Fabrica, these structures are named after Sir Astley Paston Cooper (1768 -1841), almost 300 years after being described by the great anatomist, who called them a “fleshy membrane” that stretched between the pectoral fascia and the skin.

- The vermiform appendix. Although called by many just “the appendix”, this structure is mentioned, but not named, by Jacobo Berengario da Carpi in 1524. It was Andreas Vesalius who first described it as an appendix, suggested it looked like a worm (Lat: vermis) calling it the “vermiform appendix”.

- The ligamentum suspensorium Vesalii or crural arch. First described by Giovanni Baptista Morgagni (1682-1771), it was named in honor of Vesalius by Dr. Laurentii (Lorenz) Heisters in his “Compendium Anatomicum” published in 1756. Other authors point to Gabrielle Fallopius as the first to describe this structure in 1561, although he did publish later than Vesalius (1543). Although named after Vesalius, it was later named after Francois Poupart who described it in 1695. You probably know this structure as the inguinal ligament.

-The ligamentum teres femoris. The round ligament of the femur was also first described by Vesalius in 1543.

NOTE: If you have other structures that have been named after Vesalius, please let me know by clicking here.

Sources:
1. “A Rare Cause of Foot Pain with Golf Swing. Symptomatic Os Vesalianum Pedis—A Case Report” Petrera, M et al. Sports Health. 2013 Jul; 5(4): 357–359.
2. “Andreas Vesalius’ 500th Anniversary: First Description of the Mammary Suspensory Ligaments” Brinkman RJ, Hage, JJ. World J Surg (2016) 40:2144–2148
3. “Compendium Anatomicum” Heisters, L. 1756 (German)
4. “Anatomy: An Encyclopedic Reference to the Language of Anatomy and Neuroanatomy. It Provides the Fascinating Origin of Terms and Biographies of Anatomists/Physicians Who Originated Them” Bergman, RA, Afifi, AK 2016

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