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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William S. Halsted, MD
(1852 – 1922)
American anatomist, teacher, and surgeon, William Stewart Halsted was born in New York City, USA to a wealthy family of English origin. His father was involved in charitable work and Governor and trustee to a city hospital. Not a brilliant student initially, Halsted took an undergraduate in Liberal Arts in Yale, CT., after which he entered the Medical College of Physicians at the Columbia College, where he excelled.
As a second-year medical student Halsted applied and obtained a position in surgery at a local hospital. In here he learned about Lister’s antiseptic technique and became an adamant proponent of it to reduce infection. In 1877 Halsted obtained his MD. After a short time as House Physician at the New York Hospital, Halsted traveled to Europe to further his education studying for two years at the Universities of Vienna, Leipzig, and W?rzburg.
Besides being at the forefront of surgical and antiseptic techniques (introducing the use of rubber gloves in surgery), Halsted was extremely concerned with the way medical students were taught in the US. He pioneered bedside clinical round discussions with the medical students after two years of basic sciences studies. Halsted developed the idea of a patient chart; he also developed the residency program for medical students in use today.
Halsted is probably the most influential researcher and surgeon at the turn of the century. He dedicated time to the study of intestinal anastomoses and the use of silk as a suture material. His experimental work in 1887 proved that the inclusion of the submucosa layer in an anastomosis was mandatory, as well that a single layered anastomosis was enough to attain closure. Perhaps Halsted’s most important contribution was the application and use of the scientific method to surgical questions. Halsted’s principles, also known as "Halsted's Rules of Surgery", set the standards used today in surgical suturing and surgical stapling.
He also pioneered the development and surgical techniques for radical mastectomy as a treatment for breast cancer.
As a side effect of this studied in anesthesia and the use of cocaine for anesthesia, Halsted became addicted to this substance, a problem that followed him through the years. Without impairing his capacity as a researcher and a surgeon, Halsted eventually recovered. He died in Baltimore in 1922 as a complication to surgery.
Sources:
1. Dubay, A. D., & Franz, G. M. (2003). Acute Wound Healing: The Biology of Acute Wound Failure. Surg Clin NA, 83, 463-481.
2. Halsted, W. S. (1887). Circular Suture of the Intestine - An Experimental Study. Am J Med Sci, 436-461.
3. “William Stewart Halsted: his life and contributions to surgery” Osborne, P. Lancet Oncol 2007; 8: 256–65
4. “William Stewart Halsted: Surgical pioneer” Burress, P Endoc Today (2010), 8: (2) 22
5. “William Stewart Halsted (1852–1922) Neurological stamp” Haas, LF J Neurol Neurosurg Psych 2000;69:641
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From the Latin [vertere] meaning "to turn", the term refers to one of the bones that forms the spinal column or raquis. This word was first used by Celsus both to denote the intervertebral joint and the bone itself. The plural form of the term [vertebra] is [vertebrae].
All vertebrae are different, although they have some similarities which allows us to group them by region: cervical, thoracic, lumbar, sacral, and coccygeal. The image shows us a cervical vertebra, characterized by a slender, small vertebral body and two lateral openings, the transverse foramina. If you hover your cursor over the image, a thoracic vertebra will appear. Thoracic vertebrae are characterized by a heart-shaped body, the presence of articular surfaces for the ribs, etc. With few exceptions, all vertebrae have a basivertebral foramen.
Photography by D.M.Klein
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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.
Sir Arthur Keith
Sir Arthur Keith (1866–1955) was a Scottish physician, anatomist and anthropologist. He studied medicine at the University of Aberdeen, earning his Bachelor of Medicine in 1888. He traveled to Siam and worked for three years as a medical officed in a rubber plantation and mine. Upon his return to London, he continued his medical studies at University College. He became a fellow of the Royal College of Surgeons of England in 1894.
Keith held various academic positions, including demonstrator of anatomy at the London Hospital, where his initial anatomical research expanded to include pathological specimens associated with clinical cardiology. His collaboration with Sir James Mackenzie (1853 – 1925), a cardiologist studying cardiac arrhythmias using polygraph tracings (a device used to study cardiac arrythmias before the invention of the electrocardiograph by William Einthoven (1860 – 1927), piqued Keith’s interest in the anatomical basis of heart rhythm disorders.
Image in Public Domain courtesy of Wellcome Foundation
He was also an accomplished artist, and his anatomical illustrations and dissections helped clarify the structure and pathological variations of the atrioventricular conduction system. Through extensive dissection of post-mortem hearts sent by Mackenzie, Keith contributed to understanding the relationship between structural features of the conduction system and clinical manifestations of arrhythmias.
The discovery of the sinoatrial (SA) node is among Keith’s most enduring scientific legacies. Inspired by the 1906 work of Japanese anatomist Sunao Tawara, who described the atrioventricular node and conduction pathways in the mammalian heart, Keith and Martin W. Flack (a medical student at the time) extended this work in a search for the anatomical site responsible for initiating the heartbeat.
In 1906, while studying the heart of a mole, Flack identified a distinct structure at the junction of the superior vena cava and right atrium. Recognizing its histological resemblance to known conduction tissue, Keith and Flack named this structure the sino-auricular node. They hypothesized that this node was the dominant center initiating cardiac rhythm. Their work was published in 1907 in the Journal of Anatomy and Physiology. This publication completed the anatomical outline of the conduction system of the heart as we know it today.
Keith was appointed Conservator and Hunterian Professor at the Royal College of Surgeons in 1908 and transitioned his studies toward evolutionary anatomy and anthropology. He became an influential figure in paleoanthropology, published several books on human evolution, and served as President of the Royal Anthropological Institute and Rector of Aberdeen University. Knighted in 1921 and elected Fellow of the Royal Society in 1913, Keith remained active in research and writing until his death in 1955.
Sources:
1. Mohr PD. Illustrations of the heart by Arthur Keith: His work with James Mackenzie on the pathophysiology of the heart 1903–1908. J Med Biogr. 2021;30(3):193–201
2. Silverman ME, Hollman A. Discovery of the sinus node by Keith and Flack: on the centennial of their 1907 publication. Heart. 2007;93(10):1184–1187.
3. Keith A, Flack M. The Form and Nature of the Muscular Connections between the Primary Divisions of the Vertebrate Heart. J Anat Physiol. 1907 Apr;41(Pt 3):172-89. PMID: 17232727; PMCID: PMC1289112.
4. Keith A, Flack M. The form and nature of the muscular connections between the primary divisions of the vertebrate heart. J Anat Physiol 1907;41: 172–189.
Images published in this article under SAGES permission on Creative Commons Attribution 4.0 LicenseOther images Wellcome Collection Gallerypermission on Creative Commons Attribution 4.0 License
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How to set a YouTube video closed caption (CC) in another language
- Start playing the video
- Click the closed caption icon [CC]. It will start the CC in English
- Click the Settings icon [⚙️] (gear)
- In the menu, select “Subtitles/CC” and click on [English (auto-generated) >]
- In the menu, click on [Auto-translate]
- Scroll down to the language you desire and click on it. The closed caption language will change.
- Using the time slide bar, go to the beginning of the video.
Cómo configurar los subtítulos de un video de YouTube en otro idioma
- Reproduce el video
- Haz clic en el ícono de Subtítulos [C]. Se mostrarán los subtítulos en Inglés
- Haz clic en el ícono de Configuración [⚙️] (engranaje)
- En el menú, selecciona "Subtítulos (1)" y haz clic en [Inglés (generado automáticamente) >]
- En el menú, haz clic en [Traducción automática]
- Desplázate hacia abajo hasta el idioma que desees y haz clic en él. El idioma de los subtítulos cambiará.
- Usa la barra de tiempo para ir al principio del video.
Como ativar as legendas ocultas (CC) de um vídeo do YouTube em outro idioma
- Comece a reproduzir o vídeo
- Clique no ícone de Legendas/legendas ocultas [C]. Isso iniciará as legendas em inglês
- Clique no ícone de Configurações [⚙️] (engrenagem)
- No menu, selecione “Legendas/CC (1)” e clique em [Inglês (gerada automaticamente) >]
- No menu, clique em [Tradução automática]
- Role para baixo até o idioma desejado e clique nele. O idioma das legendas ocultas será alterado.
- Usando a barra de rolagem de tempo, vá para o início do vídeo.
Come impostare i sottotitoli (CC) di un video di YouTube in un'altra lingua
- Avvia la riproduzione del video
- Fai clic sull'icona dei Sottotitoli/sottolitoli codificati [C]. Verranno visualizzati i sottotitoli in inglese.
- Fai clic sull'icona delle Impostazioni [⚙️] (ingranagio)
- Nel menu, seleziona "Sottotitoli (1)" e fai clic su [Inglese (generati automaticamente) >]
- Nel menu, fai clic su [Traduzione automatica]
- Scorri verso il basso fino alla lingua desiderata e fai clic su di essa. La lingua dei sottotitoli cambierà.
- Utilizzando la barra di scorrimento temporale, vai all'inizio del video.