Diverticulum
≈ 3 min read
Names in other languages
- Englishdiverticulum
- Françaisdiverticulum
- muldiverticulum
- Nederlandsdiverticulum
- Türkçediverticulum
- Italianodiverticolo
Article bodies are English and are not machine-translated. A name in another language is not a translation of the article.
In medicine or biology, a diverticulum is an outpouching of a hollow (or a fluid-filled) structure in the body. Depending upon which layers of the structure are involved, diverticula are described as being either true or false. In medicine, the term usually implies the structure is not normally present, but in embryology, the term is used for some normal structures arising from others, as for instance the thyroid diverticulum, which arises from the tongue. The word comes from Latin dīverticulum, "bypath" or "byway".
In medicine or biology, a diverticulum is an outpouching of a hollow (or a fluid-filled) structure in the body. Depending upon which layers of the structure are involved, diverticula are described as being either true or false. In medicine, the term usually implies the structure is not normally present, but in embryology, the term is used for some normal structures arising from others, as for instance the thyroid diverticulum, which arises from the tongue. The word comes from Latin dīverticulum, "bypath" or "byway".
Classification
Diverticula are described as being true or false depending upon the layers involved: False diverticula (also known as "pseudodiverticula") do not involve muscular layers or adventitia. False diverticula, in the gastrointestinal tract for instance, involve only the submucosa and mucosa, such as Zenker's diverticulum. False diverticula are typically synonymous with pulsion diverticula, which describes the mechanism of formation as increased intraluminal pressure. True diverticula involve all layers of the structure, including muscularis propria and adventitia, such as Meckel's diverticulum. True diverticula are typically synonymous with traction diverticula, which describes the mechanism of formation as pulling forces external to the structure.
Embryology
The kidneys are originally diverticula in the development of the urinary and reproductive organs. The lungs are originally diverticula (lung buds) forming off of the ventral foregut. The thymus appears in the form of two flask-shape diverticula, which arise from the third branchial pouch (pharyngeal pouch) of the endoderm. The thyroid gland develops as a diverticulum arising from a point on the tongue, demarcated as the foramen cecum.
Human pathology
Gallery
File:Diverticule de Meckel.jpg|Meckel's diverticulum File:Diverticula, sigmoid colon.jpg|Large bowel (sigmoid colon) showing multiple diverticula: the diverticula appear on either side of the longitudinal muscle bundle (taenium). File:Diverticulum of the colon.jpg|Colonic diverticulum File:Harnblasendivertikel-transversal.jpg|Diverticulum of the urinary bladder of a 59-year-old man, transverse plane File:BladderdiverticuliwithstoneMark.png|Bladder diverticula containing stones: the bladder wall is thickened due to possible transitional cell carcinoma. File:UOTW 56 - Ultrasound of the Week 2.webm|Bladder diverticula as seen on ultrasound with doppler File:UOTW 56 - Ultrasound of the Week 1.webm|Bladder diverticula as seen on ultrasound
See also
Christine Menias Skeletal pneumaticity
References
Text derived from https://en.wikipedia.org/w/index.php?oldid=1302583090 under CC BY-SA 4.0; modifications have been made.