Descending limb of loop of Henle cells

These are the epithelial cells lining the thin descending limb of the loop of Henle in the kidney. They are highly permeable to water but relatively impermeable to salts. As filtrate descends into the hypertonic renal medulla, water passively moves out of the tubule, concentrating the urine. This process is crucial for the kidney's ability to produce concentrated urine.