middle umbilical fold

me·di·an um·bil·i·cal fold

[TA]
a fold of peritoneum on the anterior wall of the abdomen covering the urachus, or remains of the allantoic stalk.

middle umbilical fold

the fold of peritoneum over the urachal remnant within the abdomen. Approximately 3 cm lateral to the middle umbilical fold is the lateral umbilical fold. Between the lateral and the middle folds is the medial umbilical fold. Also called plica umbilicalis mediana.