outer renal medulla loop of Henle
http://purl.obolibrary.org/obo/UBERON_0034996
http://purl.obolibrary.org/obo/UBERON_0001293
http://purl.obolibrary.org/obo/UBERON_0034997
http://purl.obolibrary.org/obo/UBERON_0001288