Medical Terminology Daily - Est. 2012

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 871 guests online


A Moment in History

Jean George Bachman

Jean George Bachmann
(1877 – 1959)

French physician–physiologist whose experimental work in the early twentieth century provided the first clear functional description of a preferential interatrial conduction pathway. This structure, eponymically named “Bachmann’s bundle”, plays a central role in normal atrial activation and in the pathophysiology of interatrial block and atrial arrhythmias.

As a young man, Bachmann served as a merchant sailor, crossing the Atlantic multiple times. He emigrated to the United States in 1902 and earned his medical degree at the top of his class from Jefferson Medical College in Philadelphia in 1907. He stayed at this Medical College as a demonstrator and physiologist. In 1910, he joined Emory University in Atlanta. Between 1917 -1918 he served as a medical officer in the US Army. He retired from Emory in 1947 and continued his private medical practice until his death in 1959.

On the personal side, Bachmann was a man of many talents: a polyglot, he was fluent in German, French, Spanish and English. He was a chef in his own right and occasionally worked as a chef in international hotels. In fact, he paid his tuition at Jefferson Medical College, working both as a chef and as a language tutor.

The intrinsic cardiac conduction system was a major focus of cardiovascular research in the late nineteenth and early twentieth centuries. The atrioventricular (AV) node was discovered and described by Sunao Tawara and Karl Albert Aschoff in 1906, and the sinoatrial node by Arthur Keith and Martin Flack in 1907.

While the connections that distribute the electrical impulse from the AV node to the ventricles were known through the works of Wilhelm His Jr, in 1893 and Jan Evangelista Purkinje in 1839, the mechanism by which electrical impulses spread between the atria remained uncertain.

In 1916 Bachmann published a paper titled “The Inter-Auricular Time Interval” in the American Journal of Physiology. Bachmann measured activation times between the right and left atria and demonstrated that interruption of a distinct anterior interatrial muscular band resulted in delayed left atrial activation. He concluded that this band constituted the principal route for rapid interatrial conduction.

Subsequent anatomical and electrophysiological studies confirmed the importance of the structure described by Bachmann, which came to bear his name. Bachmann’s bundle is now recognized as a key determinant of atrial activation patterns, and its dysfunction is associated with interatrial block, atrial fibrillation, and abnormal P-wave morphology. His work remains foundational in both basic cardiac anatomy and clinical electrophysiology.

Sources and references
1. Bachmann G. “The inter-auricular time interval”. Am J Physiol. 1916;41:309–320.
2. Hurst JW. “Profiles in Cardiology: Jean George Bachmann (1877–1959)”. Clin Cardiol. 1987;10:185–187.
3. Lemery R, Guiraudon G, Veinot JP. “Anatomic description of Bachmann’s bundle and its relation to the atrial septum”. Am J Cardiol. 2003;91:148–152.
4. "Remembering the canonical discoverers of the core components of the mammalian cardiac conduction system: Keith and Flack, Aschoff and Tawara, His, and Purkinje" Icilio Cavero and Henry Holzgrefe Advances in Physiology Education 2022 46:4, 549-579.
5. Knol WG, de Vos CB, Crijns HJGM, et al. “The Bachmann bundle and interatrial conduction” Heart Rhythm. 2019;16:127–133.
6. “Iatrogenic biatrial flutter. The role of the Bachmann’s bundle” Constán E.; García F., Linde, A.. Complejo Hospitalario de Jaén, Jaén. Spain
7. Keith A, Flack M. The form and nature of the muscular connections between the primary divisions of the vertebrate heart. J Anat Physiol 41: 172–189, 1907.


 "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

bookplateink.com

 

 

Book cover - Myology Before Vesalius
Book cover

[UPDATED 11/30/2023] This is a book published recently by my good friends Francis Van Glabbeek, Maurits Biesbrouck, and Jacqueline Vons.

This group is dedicated to the works of Andreas Vesalius and his influence on Medicine, Surgery and the Arts. As part of the analysis of Vesalius’ works they started research on a far less-known anatomist, Giovanni Battista Canani (1515 - c.1579). Cananis’ last name is sometimes presented as Canano.

The authors researched a book of which there are only 15 known copies in the world, far less than Vesalius’ Fabrica, "Musculorum Humani Corporis Picturata Dissectio". Of these 15 copies, only two are in the USA, one at Yale University, the other at Duke University. The online version of the Duke University can be seen or downloaded here.

Canani was born in Ferrara, Italy and was a remarkable and leading physician-anatomist in the sixteenth century, but he is far less well known today than contemporaries such as Vesalius, Fallopio or Colombo.His only work on the muscular anatomy of the upper limb Musculorum Humani Corporis Picturata Dissectio (Dissection Images of the Muscles of the Human Body) can in fact be considered as a masterpiece of its time, no less innovative than Vesalius’ Fabrica. The book is revolutionary in its content and contains copper etchings of exceptional quality and precision. This is the result of Canani’s extensive dissections of human corpses, performed meticulously and with a determination to discover the tiniest details of the human anatomy.

In fact, Canani came from a distinguished medical family and developed into an anatomist at an early age. He was trained by Marcantonio della Torre, an associate of Leonardo da Vinci, and was Pope Julius IIIs personal physician until his death in 1555, after which he became chief physician at the University of Ferrara. He discovered the palmaris brevis muscle in the hand and was the first to describe the valves in the veins, a fact which he communicated to his contemporary, Vesalius. Around 1542, he published a small volume of twenty leaves on the muscles of the arm and forearm. This was to be the initial book of may be a larger work he planned to produce; however, it was the only book that was completed. It is thought that he felt his work was so overshadowed by Vesalius' Fabrica that he destroyed as many copies as he could recover. This would explain the scarcity of copies of Canani’s original book.

Thankfully, the book by Van Glabbeek, Maurits Biesbrouck and Jacqueline Vons contains a color facsimile of Cananis’ publication and should be a fantastic addition for any student of Medical History or collector of Vesaliana. You can order your copy by clicking here or use the QR code in this article.

cananiqrcode sm

Professor Francis Van Glabbeek, anatomist and surgeon, founding member and member of BIOMAB (Biological and Medical Art in Belgium), is a passionate collector of antiquarian medical books, has been a driving force in continuing Vesalius’s legacy by bringing artists together with scientists, and, in the spirit of Vesalius, teaching anatomy from direct observation.

Maurits Biesbrouck is a well known Vesalius scholar who published a Dutch translation of the first volume of the 1543 Fabrica by Vesalius, as well as a Vesalius bibliography as well as a summary and discussion of the editions of his works.

Jacqueline Vons is Professor Emeritus of classical languages at Université François Rabelais in Tours, France. Together with Prof. Stephane Velut, Professor of Anatomy at the same university, she published the first French translation of Vesalius’s Epitome and is currently working on the French translation of Vesalius’s 1543 Fabrica.

Personal note: In June, 2023 I was invited by the University of Antwerp to present at the 2023 Vesalius Triennial Meeting. I used the opportunity to have Professor Francis Van Glabbeek sign my copy of his book, which is now part of my libraryDr. Miranda.

Sources:
1. “Myology before Vesalius - Giovanni Battista Canani (1515 - 1579 n.s.) and his Musculorum Humani Corporis Picturata Dissectio " Van Glabbeek,F; Biesbrouck, M.; Vons, J. 2022. Garant, Belgium.
2. "Musculorum Humani Corporis Picturata Dissectio" Sigersit, HE. 1925 Lier & Co. Florece, Italy.