metanephric mass of mesoderm

met·a·neph·ric mass of mes·o·derm

(met'a-nĕf'rik mas mez'ŏ-dĕrm) The mesoderm covering the distal end of the metanephric diverticulum; it gives rise to the nephrons in the permanent kidneys.
Synonym(s): metanephric blastema.