Aorta Renal A. Segmental a. Interlobar a. Arcuate a. interlobular a. Afferent arteriole Glomerulus Efferent arteriole Vasa Recta Interlobular v & Arcuate v . Peritubular capillaries interlobular v.-->arcuate v. Interlobar v. Renal v. Inferior Vena Cava. Afferent arteriole—each supply one nephron—leads to a ball of capillaries – glomerulus Calyces - Minor: papillae extend into funnel of mino calyx - Major:converge to form pelvis Pelvis —enlarged chamber formed by major calyces Ureter —Exits at the hilum; connects to urinary bladder. The Nephron —functional and histological unit of the kidney --Bowman’s capsule, proximal tubule, loop of Henle (nephronic loop), distal tubule Urine continues from the nephron to collecting ducts, papillary ducts, minor calyces, major calyces, and the renal pelvis. Collecting ducts, parts of the loops of Henle, and papillary ducts are in the renal medulla.
Types of Nephrons Juxtamedullary Nephrons —renal corpuscle near the cortical medullary border. Loops of Henle extend deep into the medulla. Cortical Nephrons —renal corpuscle nearer to the periphery of the cortex. Loops of Henle do not extend deep into the medulla. Renal Corpuscle —Bowman’s capsule plus a capillary bed called the glomerulus. Microcirculation of the Kidney In the cortex , peritubular capillaries branch off of the efferent arterioles supplying the tissue near the glomerulus, the proximal and distal convolated tubules. In the medulla , the efferent arterioles give rise to the vasa recta , supplying the nephron loop portion of the nephron. The Nephron— each kidney has about 1.2 million nephrons, each composed of two principal parts: Renal corpuscle —filters the blood plasma Renal tubule —long coiled tube that converts the filtrate into urine Renal corpuscle consists of the glomerulus and a two-layered glomerular (Bowman) capsule that encloses glomerulus - parietal (outer layer) of Bowman capsule = simple squamous epithelium - visceral (inner) of Bowman capsule consists of elaborate cells called podocytes that wrap around the capillaries of the glomerulus. -Capsular space separates the 2 layers of the Bowmans capsule. Vascular Pole —the side of the corpuscle where the afferent arterial enters the corpuscle and the efferent arteriole leaves. Urinary Pole —the opposite side of the corpuscle where the renal tubule begins . Glomerular Filtrate collects in capsular space, flows into proximal convulated tubule. *The afferent arteriole is larger than the efferent arteriole. Renal Tubule Renal (Uriniferous) Tubule — a duct that leads away from the glomerular capsule and ends at the tip of the medullary pyramid. Divided into 4 regions— Proximal convoluted tubule, nephron loop, distal convoluted tubule—parts of one nephron Collecting duct receives fluid from many nephrons
Proximal convoluted Tubule (PCT )— arises from glomerular capsule —(longest
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