The juxtaglomerular apparatus describes the unique region of the nephron where . The juxtaglomerular apparatus describes the unique region of the nephron where . the afferent and efferent arterioles are in contact with the proximal tubule the afferent and efferent arterioles are in contact with the distal tubule the efferent arteriole is in contact with the distal tubule the afferent arteriole is in contact with the proximal tubule the afferent arteriole is in contact with the distal tubule