the urinary system
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PowerPoint® Lecture Slides prepared by Leslie Hendon,
University of Alabama, Birmingham
HUMAN ANATOMY
fifth edition
MARIEB | MALLATT | WILHELM
23
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
The Urinary System
PART 2
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Uriniferous Tubule
Figure 23.5a
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
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
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Renal Corpuscle and the Filtration Membrane
Figure 23.6a
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Renal Corpuscle and the Filtration Membrane
Figure 23.6c
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
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
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings Figure 23.8
Collecting Tubules (Collecting ducts)
Collecting tubules Receive urine from distal convoluted tubules
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Classes of Nephron
Figure 23.9a
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
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
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Microscopic Blood Vessels
Vasa recta Thin-walled looping vessels Part of the kidney’s urine-concentrating
mechanism
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