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.

You are welcome to submit questions and suggestions using our "Contact Us" form. The information on this blog follows the terms on our "Privacy and Security Statement" and cannot be construed as medical guidance or instructions for treatment.

We have 114 guests online

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".

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

 "Clinical Anatomy Associates, Inc., and the contributors of "Medical Terminology Daily" wish to thank all individuals who donate their bodies and tissues for the advancement of education and research”.

Click here for more information

abebooks banner



XLIII Congreso Chileno de Anatomía - 2023

I had the honor of being invited to participate in the 53rd Annual Chilean Meeting of Anatomy (XLIII Congreso Chileno de Anatomía) which was held in conjunction with the 1st Latin American Congress of Clinical Morphology (Primer Congreso Latinoamericano de Morfología Clínica). Along with these meetings were two symposia: The First Joint Symposium of Chilean/Korean Anatomists and the First Joint Chilean - IFAA-FIPAE Symposium (International Federation of Associations of Anatomists - Federative International Program for Anatomy Education).

Universidad de Los Andes, Chile
Universidad de Los Andes, Chile

This meeting was held on November 11- 14, 2023 and was hosted by the University of Los Andes (Universidad de Los Andes), a Chilean institution of private higher education that offers careers and postgraduate programs in different areas of knowledge including Education, Engineering, Nursing, Obstetrics, Medicine, Psychology, Law. etc. Their campus is located on the slopes of the beautiful Andes mountains overlooking the city of Santiago, Chile.

The image shows the Main Library of the University, where the meeting was held.

On November 9 and 10, the days leading to the meeting, there were six Postgraduate Courses, from anatomy to radiology and surgical reconstruction. There were two that I would like to highlight. The first one  was a workshop "Mastering Anatomical Radiology with  IMAIOS", where one of the instructors was my good friend Dr. Cristian Uribe, who was one of the Meeting organizers. Dr. Uribe is one of the contributors to Medical Terminology Daily.

The second one was a "Workshop on Art & Science: A Theoretical-Practical Course on Anatomical Illustration". This course was directed by my good friend, Dr. Carlos Machado, world-renown medical illustrator, physician, and anatomist, editor of Netter's Atlas of Anatomy. Along with him two professors, Drs. Daniel Casanova and Valentina Cerda.

Nov. 11, 2023 Meeting opening
Nov. 11, 2023 Meeting opening

The Meeting was officially opened by Dr. Juan Carlos Lopez, Director of the Morphology Department of the Los Andes University. This was followed by a presentation on "The Role of the Placenta on the Modulation of Human Potential" by Dr. Sebastian Illanes. On the picture, from left to right, Dr. Jens Wasche (Germany), Dra. Valentina Cerda (Chile), Dr. Carlos Machado (Brazil/USA), me (Chile/USA), and Dr. Andres Riveros Valdes (Chile), a good friend and anatomist. Dr. Riveros is the President of the LatinAmerican Meeting on Clinical Morphology.

There were so many great presentations in this meeting! I think the attendees will agree with me that the conference by Dr. Carlos Machado on "The Art of Learning and Teaching Anatomy with Art" was one of the highlights of the Meeting. In his presentation Dr. Machado shared some of his early drawings and his career in Medicine and Medical Illustration, how he has used art to show patient pathology, and most important, the work and dedication that is required when developing a single image that will later become part of the Anatomy Atlases with which he collaborates. 

Dr. Carlos Machado
Dr. Carlos Machado

The image above shows Dr. Machado during his presentation. On the screen an anatomical image he drew when he was 12 year old!.

Dr. Carlos Machado
Dr. Carlos Machado

Dr. Cristian Uribe
Dr. Cristian Uribe

Poster presentations during a coffee break
Poster presentations during a coffee break

The meeting was also geared toward morphology students of different careers including Veterinary, Nursing, Dental School, and Medicine. The students presented their research posters during the coffee breaks. There were very high-quality and in-depth research, including the first osteology atlas of the Chilean flamingo (Phoenicopterus chilensis).  I had interesting discussions on Latin terminology with these students.

There were extremely interesting topics throughout the week, including liver anatomy and liver transplant, ethics, philosophy, body donation, etc.

My presentation was based on the conference I delivered in May 2023 at the University of Antwerp, Belgium. Since the Belgium conference was delivered to a group of Andreas Vesalius experts, this one included much more information on Andreas Vesalius, his work, and additional information on printing techniques circa 1550.

Dr. Miranda during his presentation at the XLIII  Anatomy Meeting in Chile
Dr. Miranda during his presentation at the
XLIII  Anatomy Meeting in Chile

The presentation added information on the history of the woodblocks used to print the 1543 Fabrica, the 1555 Fabrica, as well as other books that include the 1925 "The Iconography of Andreas Vesalius" by M.H. Spellman, and the 1934 Icones Anatomicæ.

The included picture was taken towards the end of my presentation where with the help of Dr. Uribe we unveiled Giovanni Paolo Mascagni's (1755-1815) work. At the center is a life-size copy of one of the pages of his book "Anatomiæ Universæ Icones", published in 9 installments between 1823 and 1832. It is important to note that each page of this book was hand-colored by Antonio Serantoni (1780-1837), thus the time it took to print and publish this book.

Mascagni's book, the largest book ever printed, shows in separate pages one third of a larger, life-size individual. Because of the rarity and value of this magnificent work, it cannot be cut and pasted.There are 16 know copies of Mascagni's anatomical opus magnus in the world, one of them at the University of Cincinnati, Ohio. USA.

With the help of Mr. Gino Pasi curator of the Henry Winkler Center for the History of the Health Professions, and the help of Mrs. Samantha Scheck, graphic designer, we measured and scanned some pages of the "Anatomiæ Universæ Icones", cleaned the background (no changes were done to the image itself) and pasted them digitally. The result is a life-size male 5.9 ft tall (1,75 mt). The images are incredible, and having traveled back and forth to Belgium and Chile, they are now part of my personal library.

Once again, my thanks to my old and new friends for making my stay so interesting, both personally and professionally. My thanks to the organizers of these meetings and symposia:

Dr. Juan Carlos López Navarro
President XLIII Chilean Anatomy Meeting
Director Morphology Department - Universidad de Los Andes

Dr. Andrés Riveros Valdés
President I Latin American Clinical Morphology Meeting
Professor - Universidad San Sebastián

Dra. Viviana Toro Ibacache
President Scientific Committee
Professor - Universidad de Chile

Dr. Emilio Farfán Cabello
President Chilean Anatomy Society
Professor - Pontificia Universidad Católica de Chile