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.

Aulus Cornelius Celsus and Title Page De Medicina Libri Octo”
Celsus and Title Page De Medicina Libri Octo”
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Aulus Cornelius Celsus (25 BC - 45 AD) was Roman, probably born in the south of France. A controversial character, many dispute that he was even a physician or that he actually did what is mentioned in his opus magnum “De Medicina Libri Octo.” According to some, he was what today would be considered a compiler and editor of larger books where each chapter is written by a different author. Others present Celsus as a learned scholar of noble origin, a famous physician, either way, he influenced Medicine and Surgery for centuries. Some of his canons and medical terms he coined are in use today. such as omentum, cancer, vertebra, scalpel, etc.

He is the first to describe the four pillars of inflammation: dolor (pain), rubor (redness), calor (fever), and tumor (swelling) , and in passing criticizes Erasistratus on being wrong about inflammation. In his book he states “Notæ vero inflammationis sunt quatuor, rubor, et tumor, cum calore et dolore. Quo magis erravit Erasistratus, qui febre nullam sine hac esse dixir.” Translates as: “Note that there are four signs of inflammation: redness and swelling, with heat and pain. So much was Erasistratus mistaken, when he declared there was no fever without it.” Celsus popularized the use of the term “cancer”. although it was first used by Galen of Pergamon.

Not much is known about his life or work. Quintilian mentions a work of Celsus on rhetoric, but that work is lost. Quintilian, who apparently was not a fan of Celsus, writes: “…when even Cornelius Celsus, a man of a moderate share of genius, has not only composed treatises on all these arts, but has also left precepts of the military art, agriculture, and medicine.” His quote is what leads Alexander of Padua to state that his book “De Medicina, Libri Octo” is but a small part of a larger treatise that was called “The Arts.” Celsus is known by his book “De Medicina, Libri Octo,” (On Medicine, eight books). This book is sometimes presented as “De Re Medicina, Libri Octo.” Apparently, this book was part of a larger work by Celsus that has disappeared from History. This medical book was handwritten and was lost to history until one copy was discovered in the Vatican Library and released for copying as manuscripts. Of interest is the fact that the book found was titled "Aulii Cornelii Celsi liber sextus. idemque medicinæ primus," making it understood that these were six books, not eight! This was one of the first medical books to be printed upon the invention of the printing press by Gutenberg.

The first book begins with the principles for the preservation of health; the second is dedicated to the symptoms of diseases; the third is describes treatment of diseases which affect the whole organism and the fourth is focused on the diseases where the cause is found only in certain parts of the body, such as in head, lungs etc. The fifth book is dedicated to pharmacology. The sixth, seventh, and the eighth book deal with surgery, wounds, and fractures.

His book describes the importance of cleanliness of a wound and the use of topical treatment that today would be considered antiseptics. His contributions to surgery are many including anatomy of the eye, the description of ophthalmic diseases, methods of preventive treatment and surgery including eyelid surgery. He is probably the first to describe cataract surgery.

The eighth book, almost entirely dedicated to dislocations and fractures, provides an extensive description of head injuries such as extradural hematomas, lesions distant from the impact point, and intracranial damage in cases with no overlying fractures. He also provided the first description of brain swelling exceeding the level of the skull, described several surgical indications and craniotomy techniques, recommended treatment for depressed fractures (which had been previously considered untreatable), and detailed the surgical instruments employed.

De Medicina was among the first medical books to be printed (Florence, 1478), and more than 50 editions have appeared; it was required reading in most medical schools to the present century. It is the principal historical authority for the doctrinal medical teachings of Roman antiquity. The surgical section, which even Joseph Lister studied in the 19th century, is perhaps the best part of the treatise.

W. G. Spencer, the most recent translator of his works, supports an older, minority view that the details of medical procedure, the experienced judgment shown in the selection of treatment, and the frequent use of the first person reveal an author with an intimate acquaintance of clinical medicine who must have been himself a practitioner of the medical arts.

Because of this book and the clarity of the disease descriptions and treatments both pharmacological and surgical. Celsus has been lauded as one of the Fathers of Medicine and Surgery. His influence has stood the test of time and was read well into the 1800’s.

Personal note: This article was motivated by the recent acquisition of a 1713 copy of De Medicina, that is now part of my library. The book belonged to Dr. Harry Kaufmann Hines, a renown radiologist who lived and worked in Cincinnati, OH. The book was a gift to him from his sister-in-law Erma Wright Tateman neé Sharkey in August 1961. Dr. Miranda

Sources:
1. “The Contribution of Aulus Cornelius Celsus (25 B.C.–50 A.D.) to Eyelid Surgery” Davide Lazzeri, Tommaso Agostini, Michele Figus, Marco Nardi, Giuseppe Spinelli, Marcello Pantaloni & Stefano Lazzeri (2012), Orbit, 31:3, 162-167
2. “Aulus Cornelius Celsus and the Head Injuries” GiuseppeTalamonti Giuseppe D'Aliberti, MarcoCenzato World Neurosurgery Volume 133, January 2020, Pages 127-134
3. “A. Cornelius Celsus of medicine. In eight books.” Translated, with notes critical and explanatory, by James Greive, M.D. 1756

For anyone interested in reading an online copy of this book, you can find it here.  For the translation by Greive click here.