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.

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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.


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This article is part of the series "A Moment in History" where we honor those who have contributed to the growth of medical knowledge in the areas of anatomy, medicine, surgery, and medical research.

Letter from Ephraim McDowell to Robert Thompson
Letter from Ephraim McDowell
to Robert Thompson

As some of you may know by now, I am a collector of antique medical books and books that relate to the history of anatomy and medicine.

As important as the books themselves are, there are details beyond the book itself that can take hours of my time doing research. The first one is the bookplates (also known as Ex-Libris). The have been used  for centuries by book owners and collectors to identify the books in their collections, a tradition that seems to be falling in disuse. Not me, I have one that you can see here. Some of these can lead to places that you cannot imagine initially. One of these bookplates took me to research a potential resident ghost in a library!

Provenance is also important. Where was it printed? Who owned it? Who was the illustrator? etc. I recently acquired a second copy of the book “EPHRAIM MCDOWELL, FATHER OF OVARIOTOMY AND FOUNDER OF ABDOMINAL SURGERY. With an Appendix on JANE TODD CRAWFORD”. By AUGUST SCHACHNER, M.D. Cloth, 8vo.A p. 33I. Philadelphia, J. B. Lippincott CO., I921. Dr. McDowell has also been featured in this blog in the series "A Moment in History".

This second copy is most valuable because of the papers found within the book. There is a series of notes, newspaper clippings, and copies of letters! Here is a detail of what I have found:

The book seems to have belonged to Cecil Stryker, MD.,a physician in Cincinnati, and one of the founders of the American Diabetes Association (ADA). There is a copy of a letter by Dr. Ephraim McDowell to Dr. Robert Thompson (Sr.) dated January 2nd, 1829, a year before Dr. McDowell's death. The letter is shown in the image attached. In this letter Dr. McDowell describes in his own words the ovariotomy he performed on Jane Todd. He also describes other ovariotomies he performed and his opinion on "peritoneal inflammation".

There is a note from Dr. Cecil Striker to "Bob" dated 6/3/73 when he gifted a copy of this book. In the note Dr. Striker explains that he bought several copies of the book and he is sending this copy to him. There is also a copy of Dr. McDowell's prayer (costs 25 cents), and a page of the Kentucky Advocate newspaper published in Danville, KY and dated Sunday April 15, 1973 on the restoration of Dr. Alban Goldsmith home, a surgeon who assisted Dr. McDowell in his first ovariotomy (first in the world, that is).

Last, there is a note dated September 16, 1974 from the wife of Dr. West T. Hill, Chairman of the Dramatic Arts Department at Centre College in Danville, Kentucky. In this handwritten note she mentions the McDowell family reunion that took place on June 15 and 16, 1974 in Danville. With the note comes the program and registration form for the festivities! Dr. West T. Hill was one of the many responsible for the restoration of the MacDowell Home and Museum. Today Danville has the West T. Hill community theatre that honors his name.

All of this in one book, as I always say "You know where you are going to start reading it, but you never know where are you going to end in researching it". This book will be a great addition to my library catalog. Dr. Miranda.