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Thin ascending limb of loop of Henle Scheme of renal tubule and its vascular supply. (Labeled at center left.) Nephron. Diagram is labeled in Polish, but ion flow can still be identified. Gray's subject #253 1223 The thin ascending limb of loop of Henle is a sub-portion of the loop of Henle in the nephron of the kidney. As filtrate passes back up it, the concentration of the surrounding medulla decreases. The thin ascending limb is not permeable to water, but it is permeable to ions. Sodium ions (Na+) are passively transported down this concentration gradient, from the thin ascending limb into the medulla. Histology Main article: Histology of thin segment As in the descending limb, the epithelium is simple squamous epithelium. See also Loop of Henle External links Physiology at MCG 7/7ch07/7ch07p10 Physiology at MCG 7/7ch08/7ch08p10 Overview at vet.cornell.edu This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated. This article related to the genitourinary system is a stub. You can help Wikipedia by expanding it. v • d • e v • d • e Anatomy: urinary system (TA A08, GA 11.1215) Abdomen Kidneys Layers Renal fascia • Renal capsule • Renal cortex  (Renal column) • Renal medulla (Renal sinus, Renal pyramids, medullary interstitium) • Renal lobe • Cortical lobule • Medullary ray • Nephron Intrarenal arteries (Renal artery) → Segmental arteries → Interlobar arteries → Arcuate arteries → Interlobular arteries → Afferent arterioles Renal tubule Renal corpuscle (Glomerulus, Bowman's capsule) → Proximal tubule → Loop of Henle (Descending, Thin ascending, Thick ascending) → Distal convoluted tubule → Connecting tubule → Collecting ducts aka Duct of Belini → Renal papilla → Minor calyx → Major calyx → Renal pelvis Intrarenal veins Efferent arterioles → Peritubular capillaries / Vasa recta → Arcuate vein → Interlobar veins → (Renal vein) JGA Macula densa • Juxtaglomerular cells • Mesangium/Extraglomerular mesangial cell Filtration Glomerular basement membrane • Podocyte • Filtration slits • Mesangium/Intraglomerular mesangial cell • Tubular fluid Ureters Orifice of ureter • Adventitia • Muscular layer • Mucosa Pelvis Bladder Apex • Uvula • Neck • Median umbilical ligament • Muscular layer (Trigone • Detrusor) • Mucosa • Submucosa Urethra Urethral sphincters (External sphincter muscle of male urethra, External sphincter muscle of female urethra, Internal sphincter muscle of urethra) M: URI anat/phys/devp/cell noco/acba/cong/tumr, sysi/epon, urte proc/itvp, drug (G4B), blte, urte