Chapter 25
The Urinary System
961
25
Cortex-
medulla
junction
Peritubular
capillary bed
Efferent
arteriole
Afferent
arteriole
Glomerulus
(b)
Kidney
(a)
Cortical radiate vein
Cortical radiate artery
Afferent arteriole
Afferent arteriole
Collecting duct
Distal convoluted tubule
Efferent
arteriole
Vasa recta
Nephron loop
Arcuate artery
Arcuate vein
Peritubular
capillaries
Glomerulus
(capillaries)
Glomerular
capsule
Renal
corpuscle
Ascending
limb of
nephron loop
Descending
limb of
nephron loop
Efferent
arteriole
Proximal
convoluted
tubule
• Shor
t nephron loop
• Glomer
ulus further from the cortex-medulla junction
• Ef
ferent arteriole supplies peritubular capillaries
Cortical nephron
• Long nephr
on loop
• Glomer
ulus closer to the cortex-medulla junction
• Ef
ferent arteriole supplies vasa recta
Juxtamedullary nephron
Figure 25.7
Blood vessels of cortical and juxtamedullary nephrons. (a)
Arrows indicate direction of blood flow. Capillary beds from adjacent nephrons
(not shown) overlap.
(b)
Scanning electron micrograph of a cast of blood
vessels associated with nephrons (60
3
). View looking down onto the cortex.
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