part of part of results in development of anatomical structure development long descending thin limb development metanephric long nephron development metanephric nephron epithelium development metanephric long descending thin limb development The process whose specific outcome is the progression of the metanephric long descending thin limb over time, from its formation to the mature structure. The metanephric long descending thin limb is the descending thin limb of a long nephron in the metanephros that has a squamous epithelial morphology. The long descending limb starts in the inner stripe of the outer medulla and extends into the inner medulla. GO:0072269 2010-03-30T03:12:05Z biological_process metanephric long descending thin limb