Abnormal renal glomerulus morphology Abnormal glomerular basement membrane morphology 2020-11-28T20:24:00Z Any abnormal sttructure of the glomerular basement membrane. The (GBM) is an integral component of the glomerular filtration barrier; an important and highly complex capillary wall that is exposed to mechanical forces driven by capillary hydrostatic pressure. This barrier is permeable to water and small molecules, and selectively withholds cells and macromolecules such as albumin in the circulation. Glomerular subepithelial deposits