Juxtaglomerular Apparatus:is a microscopic tissue located in the kidneys that regulates the function of each nephron. It is found between the vascular pole of the renal corpuscle and the distal convoluted tubule of the same nephron. The three cellular components of the apparatus are known as the macula densa, also the extraglomerular mesangial cells, and the juxtaglomerular (also known as granular cells).