Urogenital ridge develops from intermediate mesoderm.
After the formation of peritoneal cavity, the intermediate mesoderm is seen as a bulge in the posterior abdominal wall .
This bulge is lateral to the attachment of the dorsal mesentery is known as urogenital ridge.
The urogenital ridge has two parts :-
• The genital ridge which is medial and gives rise to the genital system.
• The nephrogenic cord which is lateral and contributes to the urinary system .