part of part of epithelial cell of intermediate tubule kidney outer medulla cell kidney loop of Henle descending limb epithelial cell kidney loop of Henle thin descending limb epithelial cell The "Kidney Loop of Henle Thin Descending Limb Epithelial Cell” also known as the thin descending limb (tDL) cell, is a component of the nephron, which is the functional unit of the kidney responsible for filtration, reabsorption, and secretion to form urine. These cells are located within the Loop of Henle, a U-shaped structure that extends from the proximal tubule and contributes to the mechanism of urine formation. The tDL is distinguished by its simple squamous epithelium and its primary function is to regulate water reabsorption, contributing significantly to the body's fluid balance management. Functionally, the thin descending limb epithelial cells are characterized by their high permeability to water, and comparatively low permeability to salts and urea. This unique feature allows for water reabsorption from the luminal fluid into the interstitium, driven by the osmotic gradient established by the ascending limb of the Loop of Henle and the collecting ducts. This effectively concentrates the urine, preserving water within the body. Furthermore, these cells play an integral role in the countercurrent multiplier mechanism, a system that achieves concentration of urine in the kidney's medullary interstitium. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) An epithelial cell that is part of some loop of Henle thin descending limb. https://cellxgene.cziscience.com/cellguide/CL_1001111 https://cdn.humanatlas.io/digital-objects/2d-ftu/kidney-nephron/v1.2/assets/2d-ftu-kidney-nephron.png https://cdn.humanatlas.io/digital-objects/2d-ftu/kidney-descending-thin-loop-of-henle/v1.1/assets/2d-ftu-kidney-descending-thin-loop-of-henle.png KUPO:0001054 Homo sapiens descending thin limb