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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Gallbladder

Published: Thursday, April 23, 2015 07:00 | Written by: Efrain A. Miranda, Ph.D. | Hits: 7032

Inferior surface of the liver. The gallbladder is depicted in green.. Public domain
Inferior surface of the liver

The [gallbladder] is a bile transient storage organ, part of the hepatobiliary tree, situated in the anteroinferior aspect of the liver. The gallbladder is found in a depression on the inferior aspect of the right lobe of the liver, the gallbladder fossa or fossa vesicae felleae.

In the gallbladder we describe its dome-shaped fundus, the body of the organ, and the neck which is the area that opens into the cystic duct. Close to the neck, the gallbladder has a small pouch (Hartmann's pouch) which is important for surgeons during a laparoscopic cholecystectomy, as this is where they will lock one of the instruments that allows them to manipulate the gallbladder for dissection of the organ from the gallbladder fossa (the gallbladder bed). The other surgical grasper is placed at the gallbladder fundus.

The gallbladder is composed by three layers. From deep to superficial they are:

• Mucosa: Characterized by a columnar epithelium. Towards the neck of the gallbladder the mucosa creates spiral ridges that continue in to the cystic duct.
• Fibromuscular layer: This layer is composed by connective tissue and smooth muscle, mostly longitudinal
• Serosa: This is an incomplete layer and is formed by visceral peritoneum covering the area of the gallbladder not in contact with the liver. In an unusual anatomical variation, the serosa layer can be almost complete, forming a pseudomesentery that may contains some veins.

The gallbladder receives its blood supply by way of the cystic artery, a branch of the right hepatic artery. The venous return is by way of multiple small veins that empty into the liver venous system. In some cases, these veins may form large sinuses between the liver and the gallbladder causing potential troublesome bleeding during a cholecystectomy. For those who like medical history, Dr. Eric Muhe performed the first laparoscopic cholecystectomy on September 12, 1985! We are but a few days from the 30th anniversary!

For more information on terminology on "gall-", "bile", "chol", and "chole", click here.

Sources:
1 "Tratado de Anatomia Humana" Testut et Latarjet 8 Ed. 1931 Salvat Editores, Spain
2. "Anatomy of the Human Body" Henry Gray 1918. Philadelphia: Lea & Febiger
Image modified by CAA, Inc. Original image courtesy of bartleby.com