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 175 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".

Sources:
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

bookplateink.com

 

 

Zygapophysis

The term [zygapophysis] is Greek. [-zyg-] means "yoked" or "paired", [-ap-] means "away" or "out", while the suffix [-(o)physis] means "growth". The term means "a paired outgrowth". Its plural form is "zygapophyses".

The term zygapophysis is used to denote four bony outgrowths or processes found in the posterior aspect of most vertebrae, arising in the zone of junction of pedicle and lamina. The zygapophyses are paired (left and right) and then they are inferior and superior. They are also called "articular processes".

Each zygapophysis presents with a smooth articular surface called an [articular facet]. Each articular facet is covered with hyaline cartilage. Two adjacent articular facets will form a synovial type joint known as a zygapophyseal joint or a facet joint.

Posterior view of a lumbar vertebra

In the cervical region the zygapophyseal joints are so close that they form a lateral pillar, known as the "lateral mass" or "articular pillar".

Arthritic degeneration of the zygapophyseal joints can lead to reduced spinal mobility and pain. The image shows the posterior view of a lumbar vertebra. Click on the image for a larger depiction.

Image property of:CAA.Inc.Photographer:David M. Klein

Back to MTD Main Page Subscribe to MTD

-cyte

The suffix [-(o)cyte] arises from the Greek [κελί] meaning "a hollow vessel" or a"cell". The term [-cyt-] can also be used as a root term, also meaning "cell". Examples of its use are:

 Leukocytopenia:  A combination of  root terms;  [leuk], means "white", and [-cyt-] means "cell".  The suffix [-(o)penia] means deficiency. A white cell deficiency
• Erythrocyte
: The root [-erythr-] means "red". A red cell, referring to a red blood cell
• 
Leukocyte: The root [-leuk-] means "white". A white cell, referring to a white blood cell
Blastocyte: The root term [-blast-] is used to mean "to build". A cell that builds. Usually refers to a fibroblast
Osteoclastocyte: A combination of  root terms;  [-oste-], means "bone", and [-clast-] means "to destroy".  A cell that destroys bone

Back to MTD Main Page Subscribe to MTD

C2 - Axis

The word [axis] arises from the Greek [άξων] meaning "axle".

[Axis] is the proper name given to the second cervical vertebra (C2). The name is from the action of C2. Because of its odontoid process and associated ligaments and joints, the axis allows the head to pivot around the axis of the odontoid process or dens.

As with all cervical vertebrae, the axis presents with foramina transversaria (no readily visible in the accompanying image), lateral masses with superior and inferior articular facets, pedicles and laminae. Usually the spinous process of C2 is bifid.

There are three atlantoaxial joints (between atlas and axis). Two of them are posterolateral, the zygapophyseal or facet joints. The median atlantoaxial joint between the atlas and the odontoid process of the axis is important in axial rotation of the head.

C2 - Axis

The superior articular processes of the axis forms part of the posterolateral atlantoaxial joints . In an uncharacteristic situation, the superior articular facet extends slightly from the lateral mass into what is considered the body of C2.

The median atlantoaxial joint components and its related ligaments, the alar ligament, the cruciform ligament, and the apical ligamen of the dens will be featured in separate articles.

Image property of:CAA.Inc.Photographer:David M. Klein

Back to MTD Main Page Subscribe to MTD

Odontoid process

The term [odontoid] arises from the Greek [δόντι] meaning "tooth". The suffix [-oid] means "similar to". Similar to a tooth.

The odontoid process, also known as the "dens", is a tooth-like bony process found in the anterior aspect of the second cervical vertebra (C2), also known as the "axis" because of its function, serving as a pivot point to the head.

Embryologically, the odontoid process is the body of the first cervicalvertebra (C1, atlas) that has been incorporated into C2. This is proven by the presence, deep in the structure of the dens, of a small remnant of an intervertebral disc-like structure. This concept has been challenged by different authors.

C2 - Axis

The dens presents a small anterior facet to articulate with the posterior aspect of the anterior arch of the atlas (C1), a posterior area for the attachment of the alar ligaments, and a small ligament at its apex, the apical ligament, that attaches to the inferior aspect of the occipital bone.

Image property of:CAA.Inc.Photographer:David M. Klein

Back to MTD Main Page Subscribe to MTD

Paracelsus


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.To search all the articles in this series, click here.
Paracelsus (1493 – 1541). Swiss physician and alchemist , Phillipus Aureolus Theophrastus Bombast Von Hohenheim was born in Einsiedeln in 1493 (one year after Columbus discovered America) in what is today is Switzerland. At an early age he became a migrant student, visiting several universities including T?bingen, Vienna, W?rttemberg, Heidelberg,  and Cologne. There is discussion as to whether he received or not a medical degree, although most authors today agree he might had. In 1510 he moved to Ferrara where he attained (apparently) his medical degree in 1516. During his constant travels he started to understand that folk medical treatment based on actual observation was better than what was published and followed blindly by the physicians of the time.

He started to call himself “Paracelsus” which means “alongside Celsus”, seen as one of the greatest physicians in history. Paracelsus continued his travels, visiting Egypt and Jerusalem. It is at this time that he started delving into the world of alchemy, returning to his home circa 1524.

Paracelsus was appointed “Town Physician” of the city of Basle but created controversy when he started lecturing in German (not Latin) and invited the general public as well as his students to his lectures. In his presentations he introduced the concepts of direct observation of the patient and empirical treatment, based his statements on experiments and reasoning opposing the “classics” Galen, and Avicenna.

Paracelsus. Image courtesy of the National Library of Medicine
Original image courtesy of the National Library of Medicine
In 1527, during a demonstration he publicly burned the works of Avicenna to prove his point. This caused a backlash from the university and town authorities who expelled him in 1528. From this point on, Paracelsus’ life is constant wandering. He settles for a time and then travels again. In spite of his disdain for the works of the “medical greats”, he himself writes a large number of works, including medicine, surgery, theology, astronomy, magic, etc.  Many of these works are not published until after his death as he is considered to be contradicting Galen. In 1530 he writes the best description of syphilis and recommended its treatment with mercury.

In 1541 he was appointed to a post on the staff of Duke Ernest of Bavaria, but he died in mysterious circumstances on September 24 of that year at the White Horse Inn in Salzburg.

Paracelsus is a controversial image, bound in legend. For many, Paracelsus was bombastic, quarrelsome, opinionated and a drunkard. For others he is a figure of his time, clashing with the classics and giving us a new way to look at the world and at diseases. He taught that wounds must be allowed to drain and not, as was common, packed with unhealthy materials.  According to him, the human body primarily consists of salt, sulphur, and mercury, and it is the separation of these elements that causes illness. He introduced mineral baths and made opium, mercury, lead and other minerals part of his treatment, foreshadowing modern pharmacology with the use of chemical remedies, mercury for syphilis, laudanum and antimony. Paracelsus stated in 1538 that “Everything is a poison, the dose alone which makes a thing not a poison”.

I just discovered an interesting chain of events. For a time Paracelsus had a medical student that later decided not to continue his medical studies and instead dedicated himself to the new art of printing. His name was Johannes Oporinus and he was the printer that Andreas Vesalius selected to print his masterpiece, the "Fabrica".

Sources
1. “Paracelsus”  Abbott.A. Nature 366: (1993) 98
2. “Paradigm lost: a celebration of Paracelsus on his quincentenary” Feder. G. Lancet. 341: (1993) 1396-1397
3. “Does Paracelsus deserve a place in the medical pantheon?” Bynum, B. 367: (2006) 29; 1389–1390
4. “Paracelsus: founder of medical chemistry” Endeavour 15:4 (1991) 147
5. “Paracelsus: the medical Luther” Leary B. 73: 3(1984) 131-133
6. “Paracelus and the Philosopher’s Stone” TenHoor, W. Am J Surg (1935) 30:3 563-572

Back to MTD Main Page Subscribe to MTD

Arthrodesis

This word is of Greek origin composed of the root term [-arthr-], meaning "joint", as in an bony articulation, and the suffix [-(o)desis], meaning "to bind together".

An arthrodesis is the surgical immobilization of a joint by fusion or the application of surgical devices (rods, screws, etc) to the bony components of a joint. 

Back to MTD Main Page Subscribe to MTD