2. The juxtaglomerular apparatus Including macula densa, extraglumerular mesangial cells, and juxtaglomerular (granular cells) cells Efferent 92001 BrooksCole.Thomson Learning Lumen of Endothelial Bowmans capsule Distal tubule Smooth Bowmans capsule Efferent arteriole capillaries Afferent arteriole acu densa Podocyte Granular cells Distal tubule Afferent arteriole2. The juxtaglomerular apparatus Including macula densa, extraglumerular mesangial cells, and juxtaglomerular (granular cells) cells