part of develops from ends during starts during intermediate mesoderm glomeral mesenchyme corpuscle xenopus_anatomy UBERON:0007128 XAO:0000110 Portion of tissue that consists of the precursors of the pronephric glomus or glomerulus; derived from the medial portion of the pronephric intermediate mesoderm. glomerulus urogenital system embryonic structure NF stage 21 NF stage 29 and 30