the urinary system
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
PowerPoint® Lecture Slides prepared by Leslie Hendon,
University of Alabama, Birmingham
HUMAN ANATOMY
fifth edition
MARIEB | MALLATT | WILHELM
23
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The Urinary System
PART 2
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Uriniferous Tubule
Figure 23.5a
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The Nephron
Renal corpuscle Glomerulus and glomerular capsule
Glomerulus – tuft of capillariesCapillaries of glomerulus are fenestrated
Glomerular (Bowman’s) capsule Parietal layer – simple squamous epitheliumVisceral layer – consists of podocytes
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Renal Corpuscle and the Filtration Membrane
Figure 23.6a
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Renal Corpuscle and the Filtration Membrane
Figure 23.6c
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Tubular Section of Nephron
Filtrate proceeds to renal tubules from glomerulus Proximal convoluted tubule Loop of Henle
Descending limbThin segmentThick segment
Distal convoluted tubule
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Micrograph through the Renal Medulla
Figure 23.7
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Classes of Nephron
Cortical nephrons 85% of nephrons
Juxtamedullary nephrons 15% of nephrons
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Collecting Tubules (Collecting ducts)
Collecting tubules Receive urine from distal convoluted tubules
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Classes of Nephron
Figure 23.9a
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Microscopic Blood Vessels
Nephrons associated with two types of capillary beds (a portal system) Glomerulus
Fed and drained by arteriolesAfferent and efferent arterioles
Peritubular capillariesArise from efferent arteriolesLow-pressure, porous capillariesAbsorb solutes
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Microscopic Blood Vessels
Vasa recta Thin-walled looping vessels Part of the kidney’s urine-concentrating
mechanism