part of part of results in development of kidney development anatomical structure development renal outer medulla development biological_process The process whose specific outcome is the progression of the renal outer medulla over time, from its formation to the mature structure. The renal outer medulla is the region of the kidney that lies between the renal cortex and the renal inner medulla. 2010-01-25T04:00:42Z GO:0072054 outer renal medulla development outer medulla of kidney