The filtration membrane is a structure that is located in the renal corpuscle within the nephron. The filtration membrane is composed of three layers which are two epithelia and the basement membrane shared between. The layers are; (i) the porous glomerular endothelium (the innermost epithelium) (ii) the basement membrane and (iii) the podocytes (the outer epithelium). During filtration, the filtration membrane prevents the movement of substances such as blood cells and large proteins but it allows other substances such as water and positively charged particles to pass through.
