Vitelline duct
| Vitelline duct | |
|---|---|
 | |
 Sketches in profile of two stages in the development of the human digestive tube. (Vitelline duct labeled on bottom image.) | |
| Details | |
| Days | 28 |
| Precursor | Midgut, yolk sac |
| Identifiers | |
| Latin | ductus vitellinus |
| MeSH | D014816 |
| Anatomical terminology | |
In the
Function
Obliteration
Generally, the duct fully obliterates (narrows and disappears) during the 5–6th week of
Persistence
The yolk sac can be seen in the
Clinical significance
Meckel's diverticulum
Sometimes a narrowing of the lumen of the ileum is seen opposite the site of attachment of the duct. On this site of attachment, sometimes a pathological Meckel's diverticulum may be present.
A mnemonic used to recall details of a Meckel's diverticulum is as follows: "2 inches long, within 2 feet of ileocecal valve, 2 times as common in males than females, 2% of population, 2% symptomatic, 2 types of ectopic tissue: gastric and pancreatic". In the decades since the mnemonic was developed, further epidemiology has found the incidence of symptomatic diverticulae to be 4%, not 2%,[3][4] and the incidence to be 2–5x greater in males than females, but the mnemonic is still helpful.
Additional images
-
Front view of two successive stages in the development of the digestive tube.
References
- ^ a b c d Elsevier, Dorland's Illustrated Medical Dictionary, Elsevier.
- ^ ISBN 978-0-07-163340-6.
- ^ Robbins and Cotran, Pathologic Basis of Disease, 8th ed., p. 766
- ^ Brant and Helms, Fundamentals of Diagnostic Radiology, 4th ed., p. 778
Further reading
- WebMD (2009). "omphalomesenteric duct". Webster's New World Medical Dictionary (3rd ed.). Houghton Mifflin Harcourt. pp. 305–6. ISBN 978-0-544-18897-6.
| Authority control databases: National |
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