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PART 2. The Urinary System. Uriniferous Tubule. Figure 23.5a. The Nephron. Renal corpuscle Glomerulus and glomerular capsule Glomerulus – tuft of capillaries Capillaries of glomerulus are fenestrated Glomerular (Bowman’s) capsule Parietal layer – simple squamous epithelium
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PART 2 The Urinary System
Uriniferous Tubule Figure 23.5a
The Nephron • Renal corpuscle • Glomerulus and glomerular capsule • Glomerulus – tuft of capillaries • Capillaries of glomerulus are fenestrated • Glomerular (Bowman’s) capsule • Parietal layer – simple squamous epithelium • Visceral layer – consists of podocytes
Renal Corpuscle and the Filtration Membrane Figure 23.6a
Renal Corpuscle and the Filtration Membrane Figure 23.6c
Tubular Section of Nephron • Filtrate proceeds to renal tubules from glomerulus • Proximal convoluted tubule • Loop of Henle • Descending limb • Thin segment • Thick segment • Distal convoluted tubule
Micrograph through the Renal Medulla Figure 23.7
Classes of Nephron • Cortical nephrons • 85% of nephrons • Juxtamedullary nephrons • 15% of nephrons
Collecting Tubules (Collecting ducts) • Collecting tubules • Receive urine from distal convoluted tubules Figure 23.8
Classes of Nephron Figure 23.9a
Microscopic Blood Vessels • Nephrons associated with two types of capillary beds (a portal system) • Glomerulus • Fed and drained by arterioles • Afferent and efferent arterioles • Peritubular capillaries • Arise from efferent arterioles • Low-pressure, porous capillaries • Absorb solutes
Microscopic Blood Vessels • Vasa recta • Thin-walled looping vessels • Part of the kidney’s urine-concentrating mechanism