The umbilical hernia occurs through the umbilical ring, which is a natural defect in the abdominal wall at the site of the umbilicus. During fetal development, the umbilical ring allows passage of umbilical vessels, and if it fails to close properly after birth, abdominal contents can herniate through this area. This distinguishes it from other hernias, which occur at different anatomical sites. The key surgical point is that the defect lies at the site of the fibrous scar of the umbilical ring, leading to a hernia sac protruding beneath or around the umbilicus. Recognizing its location is crucial for both diagnosis and appropriate repair technique.

Reference: Gray's Anatomy, Standring S, 42nd Edition.