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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Larynx

The term [larynx] originates from the Greek [λάρυγξ] meaning "upper windpipe or throat". Known vernacularly as "Adam's apple" or the "voice box" (not proper clinical terms), the larynx is the organ of phonation, and one of the organs found in the cervical visceral compartment. It is found immediately superior to the trachea, and anterior to the pharynx and esophagus.

It is formed by nine cartilages, three of which are median and single (epiglottis, thyroid, and cricoid cartilages), the rest being paired (arytenoid, corniculate, and cuneiform cartilages). In the accompanying image, the thyroid cartilage is depicted in blue, and the cricoid cartilage in green.

Within the larynx is a pair of musculomembranous folds, the vocal cords, which are innervated by the recurrent laryngeal nerves, branches of the Xth cranial nerve, also known as the vagus nerve. 

The thyroid gland (in purple) is related to the inferior aspect of the larynx. The gland receives its name from the thyroid cartilage of the larynx, as the Greek term [θυροειδής] (thyreoeidís) means "in the shape of an oblong-shield".

It was Andrea Vesalius who named the cricoid cartilage because of its shape. The Greek term [κρικοειδή] (krikoeidí) refers to a structure "shaped like a ring". The cricoid cartilage is a complete ring, and thus is different from the incomplete or "C" shaped rings of the trachea.

Image property of CAA Inc. Artist: Dr. Miranda

Cervical viscera

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