part_of part of part of organ part inner renal medulla vasa recta inner medulla vasa recta descending limb uberon KUPO:0001003 This class was created in order to align KUPO with CL. The original class was undefined, and the intended meaning is not clear, may be obsoleted in future. The vasa recta is parallel to the loop of Henles, this may refer to the portion of the vasa recta in the inner medullar parallel to the descending limb UBERON:0009089