In descending limb of loop of Henle, the water is reabsorbed from filtrate flowing in it due to increasing osmolarity of interstitial fluid. Sodium and other solutes are not reabsorbed here. The filtrate becomes hypertonic to blood plasma. All nephrons have their renal Malphigian corpuscles in the cortex. Cortical nephrons have their loop of Henle in the renal medulla near its junction with the renal cortex, while the loop of Henle of juxtamedullary nephrons is located deep in the renal medulla; they are called juxtamedullary because their renal corpuscle is located near the medulla (but still in the cortex).