Morphology of the Umbilical Ring
The umbilical ring is a natural anatomical cleft located directly in the projection of the linea alba. Visually, the umbilicus appears as a retracted scar that securely closes this defect in a healthy individual.
A key anatomical feature of the umbilical ring is that its edges are sharp and completely regular. The architectonics of these edges are formed by dense tendinous fibers of the aponeuroses. Notably, the aponeuroses of all broad muscles of the anterior abdominal wall participate in forming this tendinous framework.
During the intrauterine period of development, this ring performs a critically important function: the umbilical cord passes precisely through this cleft. This structure provides a direct connection between the developing fetus and the maternal organism, ensuring blood circulation and nutrition.
Layered Structure of the Abdominal Wall in the Umbilical Region
The topographic anatomy of the umbilical region has distinct specificities. Unlike the surrounding areas of the abdominal wall, tissues here are presented as a thin, monolithic sheet.
The layers of the umbilical region are distinguished as follows (from outside to inside):
- Skin — thinned and deformed into the shape of a retracted scar.
- Scar tissue — fills the space of the umbilical ring.
- Transversalis fascia — lies directly adjacent to the scar mass.
- Peritoneum — the internal parietal layer.
Crucial topographic feature: All listed layers are tightly fused together into a single conglomerate. There are no cellular spaces between them, making this zone unique from the perspective of surgical anatomy.
Surgical Significance and Potential Pathology
Knowledge of the topography of the umbilical region and the linea alba is essential for a surgeon to safely perform surgical interventions.
The linea alba, of which the umbilical ring is an element, is widely used for surgical approaches. Incisions to open the abdominal cavity are most frequently made along this line — this manipulation is termed a laparotomy.
From a clinical standpoint, the umbilical ring is classified among the "weak spots" of the anterior abdominal wall. If the umbilical ring stretches under the influence of various factors, its anatomical integrity is compromised. As a result of this pathology, patients develop umbilical hernias — the protrusion of internal organs through the widened defect of the linea alba beneath the skin.
Briefly: answers to topical questions
What anatomical structures pass through the umbilical ring as part of the umbilical cord in the fetus?
Blood vessels surrounded by a gelatinous substance and nerve endings pass through the umbilical ring as part of the umbilical cord in the fetus.
- Umbilical vessels — include the umbilical vein (v. umbilicalis) and umbilical arteries (aa. umbilicales).
- Wharton's jelly — a gelatinous substance that surrounds and fixes the vessels, protecting them from trauma.
- Nerve endings — are located along the umbilical vessels.
Which veins form the portacaval anastomosis in the umbilical region?
The portacaval anastomosis in the umbilical region is formed through the connection of anterior abdominal wall veins with the portal vein system via paraumbilical veins.
- Paraumbilical veins (vv. paraumbilicales) — run within the round ligament of the liver and connect the anterior abdominal wall veins to the portal vein system.
- Superficial epigastric vein (v. epigastrica superficialis) — collects blood from the lower parts of the anterior abdominal wall and anastomoses with the paraumbilical veins.
What ligaments do the blood vessels of the umbilical cord transform into after birth?
After birth, the blood vessels of the umbilical cord undergo obliteration and transform into connective tissue cords and ligaments.
- Umbilical vein (v. umbilicalis) — transforms into the round ligament of the liver (lig. teres hepatis).
- Umbilical arteries (aa. umbilicales) — their distal parts become obliterated, forming the umbilical artery cords (chordae aa. umbilicales), over which the peritoneum forms the medial umbilical folds.
Which parietal peritoneal folds converge on the umbilical ring on the posterior surface of the anterior abdominal wall?
The following parietal peritoneal folds head toward the umbilicus on the posterior surface of the anterior abdominal wall:
- Median umbilical fold (plica umbilicalis mediana) — unpaired, runs from the apex of the urinary bladder to the umbilicus and contains the obliterated urachus (urachus).
- Medial umbilical folds (plicae umbilicales mediales) — paired, run from the lateral surface of the urinary bladder to the umbilicus and contain the obliterated umbilical arteries.
- Lateral umbilical folds (plicae umbilicales laterales) — paired, located over the inferior epigastric artery and vein.
- Round ligament of the liver (lig. teres hepatis) — a fold running from the umbilicus superiorly toward the corresponding fissure of the liver and containing the obliterated umbilical vein.
Why is the umbilical ring classified as a "weak spot" of the anterior abdominal wall from an anatomical perspective?
The umbilical ring is classified as a "weak spot" of the anterior abdominal wall due to anatomical features predisposing to the formation of umbilical hernias.
- Absence of a muscular layer — the abdominal wall in the umbilical region is represented by skin, scar tissue, transversalis fascia, and peritoneum.
- Umbilical ring — a natural cleft in the linea alba through which the umbilical cord passed during the intrauterine period.
- Tight fusion of layers — all layers in the umbilical region are tightly fused together; however, this does not provide sufficient mechanical protection during a significant increase in intra-abdominal pressure.
- Upon stretching of the umbilical ring, umbilical hernias occur.
To memorize the layers (from outside to inside), use the acronym S-S-T-P: Skin, Scar tissue, Transversalis fascia, Peritoneum — all layers are tightly fused!
Class and exam questions
What forms the edges of the umbilical ring?
The edges of the umbilical ring are formed by tendinous fibers of the aponeuroses of all broad abdominal muscles. They feature sharp and regular contours.
What is the characteristic feature of the abdominal wall layers in the umbilical region?
The main feature is that all four layers (skin, scar tissue, transversalis fascia, and peritoneum) are tightly fused together.
What role does the umbilical ring play during the prenatal period?
During embryonic development, the umbilical cord passes through the umbilical ring, physiologically connecting the fetus to the mother.
What pathological condition does stretching of the umbilical ring lead to?
Dilation of the umbilical ring leads to the formation of umbilical hernias — the protrusion of abdominal cavity organs through the widened cleft.
What else to study on this topic
- Topographic Anatomy of the Linea Alba and Laparotomy Technique
- Structure and Walls of the Inguinal Canal
- Topography of the Femoral Ring and Femoral Hernias
- Semilunar Line (Spigelian Line) as a Landmark
- Broad Abdominal Muscles and Their Aponeuroses
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