Onard Mejino - 2014-01-13

Mesangium is defined in the FMA as "Stroma between glomerular capillaries or between glomerular capillaries and macula densa".
Glomerular mesangium: Mesangium between glomerular capillaries.
Extraglomerular mesangium: Mesangium between the glomerular capillaries and macula densa.