Anatomical position of umbilicus in Latin-American patients

The umbiIicus is a natural scar, and the periumbilical area is characterized by a round or ellipsoid shape with a slight depression of 2.5–3.0 cm in diameter. It represents an essential feature in the overall body contour, and consequently exists as one of the most esthetically recognized landmarks on the abdominal wall. The umbilicus lies along the midline at the level of the intervertebral discs between the third and fourth lumbar vertebrae and is considered the only admissible scar on the human body. Given that the umbilicus aids in defining the median abdominal sulcus, it is considered the greatest esthetic component of the abdomen. Thus, the effect of the umbilicus on the esthetic appearance of the abdomen remains key—its position on the abdominal wall and its shape and depth represent important factors influencing conceptions of beauty and psychological well-being.

The aim of this study was to establish a quantitative index by evaluating skeletal landmarks surrounding the anterior wall of abdomen to determine the normal anatomical position of the umbilicus in a sample of Latin-American young women. In this descriptive cross-sectional study, 100 nulliparous Latin-American women, aged 21 to 32 years, were enrolled and examined in the supine position. The mathematical relationship of the umbilicus to various nearby anatomical structures (xiphoid process, pubic symphysis, vulvar commissure, and iliac crests) was determined in order to define its ideal localization.

In the majority of patients, we observed a slight lateral deviation of the umbilicus, an average distance measuring 14.55 cm between the xiphoid process and the umbilicus, and an average distance measuring 13.14 cm between the umbilicus and the pubic symphysis, with a ratio of 1.10:1. In patients on whom the umbilicus was located medially, the relationship of the distance between the umbilicus and the anterior superior iliac crest, and the distance between both iliac crests, had a ratio of 0.53:1.

Although numerous studies have examined what constitutes the esthetically ideal umbilicus, no publication, up until now, reports mathematical values.

Level of Evidence: Level III, risk / prognostic study.