juxtaglomerular apparatus, a collection of cells located beside each renal glomerulus, consisting of a portion of the distal convoluted tubule arising from that glomerular capsule, segments of the afferent and efferent arterioles closest to the glomerulus, and cells lying between these structures. It is involved in the secretion of renin and EPO in response to blood pressure changes and is important in autoregulation of certain kidney functions. Also called juxtaglomerular complex.
