Urinary System - Urinary System Gross Anatomy Consist of...

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Urinary System Gross Anatomy Consist of six organs Kidneys (2) Ureters (2) Urinary bladder Urethra Right slightly lower than left due to space occupied by liver Gross Anatomy Retorperitoneal (lie between the peritoneum and body wall) at the level of T12-L3 Gross Anatomy Each weight about 160g and measures 12cm long by 5-6cm wide and 2.5-3cm thick Lateral surface convex, medial surface concave and has a slit called the hilum where it receives the renal artery, vein, ureter and lymphatic vessels Gross Anatomy Protected by three layer of c.t. Renal fascia- binds the kidney and associated organs to the abd. Wall Adipose tissue- a layer of fat that cushions the kidney and holds it in place Renal capsule- a fibrous sac that is anchored at the hilum and encloses the rest of the kidney like a cellophane wrapper, and protects it from trauma and infection Gross Anatomy Renal parenchyma (glandular tissue that forms the urine) appears C-shaped in frontal section and encircles a medial space called the renal sinus (containing blood vessels, nerves, and urine collecting structures) Parenchyma is divided into two zones Renal cortex- about 1cm thick Inner medulla Gross Anatomy Renal columns (extensions of the cortex) project toward the sinus and divided the medulla into 6-10 renal pyramids Each pyramid is conical, with a broad base facing the cortex and a blunt point called the renal papilla facing the sinus One pyramid and the over laying cortex constitute one lobe of the kidney Gross Anatomy The papilla and each renal pyramid is nestled in a cup called a minor calyx which collects urine. Two or three minor calices converge to form a major calyx , and two or three major calices converge in the sinus to form the funnel-like renal pelvis The ureter is a tubular continuation of the renal pelvis that drains urine down to the urinary bladder.
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Micro Anatomy Each kidney contains 1.2 million functional units called nephrons Micro Anatomy A nephron consist of two principal parts Renal corpuscle - (glomerulus) where the blood plasma is filtered Renal tubule - processes the filtrate into urine Micro Anatomy Consist of a ball of capillaries called a glomerulus enclosed in a two-layered glomerular (Bowman’s) capsule The parietal layer is a simple squamous epithelium. The visceral layer consist of cells called podocytes wrapped around the capillaries. The fluid that filters from the glomerular capillaries, called glomerular filtrate , collects in the capsular space between the parietal and visceral layer and then flows into the renal tubule. Renal (Uriniferous) Tubule Is a duct that leads away form the glomerular capsule and ends at the tip of a medullary pyramid Divided into four major regions Proximal convoluted tubule Nephron loop (loop of Henle) Distal convoluted tubule Collecting duct (not really a part of the nephron- receives urine from
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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Urinary System - Urinary System Gross Anatomy Consist of...

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