# Umbilical ring

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The **umbilical ring** is a dense fibrous ring surrounding the [umbilicus](/source/Navel) at birth.[1] At about the sixth week of [embryological development](/source/Embryological_development), the [midgut](/source/Midgut) herniates through the umbilical ring; six weeks later it returns to the abdominal cavity and rotates around the [superior mesenteric artery](/source/Superior_mesenteric_artery).

Dense embryonic [connective tissue](/source/Connective_tissue) encircles the attachment of the [umbilical cord](/source/Umbilical_cord). It forms an umbilical ring of [mesodermal](/source/Mesoderm) condensation surrounding the [coelomic portal](/source/Coelom), and is present in the 16 mm. embryo, but more emphatically so in the 23 mm. embryo. The [compact tissue](/source/Compact_tissue) first appears in the stalk mesoderm, situated superficial to the [allantoic vessels](/source/Allantois). Cranially it lies ventral to the umbilical vein and on each side extends into the tissue of the lateral pillars of the cord bounding the coelom. When the myotomic downgrowths reach the ventral aspect, their anterior portions (i.e. the sheaths of the recti muscles) become continuous with the tissue of the umbilical ring.[2]

## Umbilical hernia

When the umbilical ring has failed to close during the gestation (pregnancy) which results in a central defect in the lineal alba. Umbilical hernias are smaller than one centimeter in size that it is present at birth but will only close in four to five years of life. In some cases, hernias do not need any surgical repair but when it is larger in size that protrusion is blighting to the parent and the child, it would require to get an early surgical repair. It is more common in women with increased intra-abdominal pressure during pregnancy. [3]

## References

1. Dye, Frank J. (21 February 2012). [*Dictionary of Developmental Biology and Embryology*](https://books.google.com/books?id=l7pNfWhZBFYC). John Wiley & Sons. p. 216. ISBN 9781118076514.

1. Wyburn, GM (1939). ["The formation of the umbilical cord and the umbilical region of the anterior abdominal wall"](https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_formation_of_the_umbilical_cord_and_the_umbilical_region_of_the_anterior_abdominal_wall). *Journal of Anatomy*. **73** (2): 289–310. [PMC 1252509](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1252509). [PMID 17104757](https://pubmed.ncbi.nlm.nih.gov/17104757)

1. ["Umbilical Hernia Article - StatPearls"](https://www.statpearls.com/kb/viewarticle/30753/). *www.statpearls.com*. Retrieved 2019-04-11.

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Adapted from the Wikipedia article [Umbilical ring](https://en.wikipedia.org/wiki/Umbilical_ring) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Umbilical_ring?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.