Intermediate mesenchyme or intermediate mesoderm is a type of mesoderm (an embryological tissue) that is located between the paraxial mesoderm and the lateral plate.It develops into the part of the urogenital system (kidneys and gonads), as well as the reproductive system. forms of urogenital system series of short evaginations from each segment grows dorsally caudally vestiges of the future kidney, the pronephros briefly appears.