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Anatomy & Histology of the
Urinary System: the
Kidneys, Ureters, Bladder &
Urethra
John E. B. Baker,
mikrogeo.com
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Kidneys
Ureters
RENAL
VEINS
RENAL
ARTERIES
behind Veins
Adrenal
Glands
CT
ScanInf. Vena
Cava
Aorta
Psoas
Musc.
Liver
Stomach
Spleen
Vert.
Inf Vena Cava Aorta
Ribs
Ribs
Ribs
Retroperitoneal
diaphragm
RectusM
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Pelvis
Ureter
Medulla
Cortex
Pyramids Collecting
Tubules
Renal
Capsule
Xerox of section
Calyx
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Rat Kidney: Renal Artery injected (perfused) with carmine geland cleared
Glomeruli
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RENAL VEINS
RENAL ARTERY
Pyramid of Medulla:
Collecting Tubules &
Thin loops of Henle
Cortex
Small section of Human
Kidney
Calyx
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Injected capil lary balls = GLOMERULI
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4 Glomeruli and an injection
filled one
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Distal
convoluted
tubule
Proximalconvoluted
Tubule
Bowmans
Capsule
Juxtaglomerular Apparatus in wall of Afferent arteriole
Macula Densa
Capillaries
surrounded by
Podocytes =
GlomerulusBlood
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Distal
convoluted
tubule
Macula Densa
Juxtaglomerular Apparatus in wall of Afferent arteriole
Blood
Blood
Capillaries
surrounded by
Podocytes =Glomerulus
BowmansCapsule
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Podocytes
Cap.
Cap.
Cap.
Cap.
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Juxtaglomerular Apparatus in
wall of Afferent arteriole:
Renin Angiotensinogen,
Angiotensin I, etc.
Distal
convoluted
tubule
Macula Densa: Cl-
sensitive
ProximalConv.
Tubule-note
microvilli
Bowmans
Capsule
Distal Tubule
no microvil li
Proximal Tubule
w/ microvi ll i
(brush border)
Histology & Function =
Homeostasis
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Summary of Histology
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Physiological Aspects
of Urine Formation
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Collecting
TubuleArt
Glomerulus
Proximal
Tubule
Proximal
Tubule
Proximal
Tubule
Proximal Tubule
w/ microvi ll i
(brush border)
Distal Tubule
no microvil li
Distal Tubule
no microvil li
Distal Tubule
no microvil li
Distal Tubule
no microvil li
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MEDULLARY RAY
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Calyx ofPyramid:
Collecting
Tubules, Loops
of Henle and
Blood VesselsReabsorbing
Essential Ions
and Water.
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Collecting Tubules
Blood Vessels
Thin
Segments
or LOOPS
of HENLE
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Uric Acid crystals and
Oxalate crystals form
in urine : if they form
sharply edged
concentricallylaminated growths they
are painful KIDNEY
STONES, especially
passing in small
diameter Ureter
Polarized Lt.,
XN, Gypsum
filter
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Hi X, Polarized Lt.
Uric Acid crystals and Oxalate crystals form in urine : if they form sharply
edged concentrically laminated growths they are painful KIDNEY STONES
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URETER
TransitionalEpithelium
Lumen
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Circular Smooth
Muscle of
Muscularis
Outer Longitudinal
Smooth Muscle of
MuscularisInner
Longitudinal
Smooth Muscle
of Muscularis
Mucosa:
Transitional
Ep. & CT
Lumen
URETER
Serous
layer
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Urinary Bladder (almost full)
FemurHead
Greater
trochanter
Sacrum
Rectum
Uterus
FemoralA&V
Gluteus
Femoral V&A
Sm.Intestine
Colon w/
feces & gas
CT Scan
Always read cat scans as though looking up toward head from feet
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Binucleate cells
Transitional Epithelium ofBladder: accomodates
expansion of bladder as
cells roll past each other
CT
CTBasement
Membrane
Lumen
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Urinary
Bladder
Serosa
Outer
Longitudinal
Smooth Muscle
of Muscularis
Mucosa:
Transit ional Ep. &
InnerLongitudinal
Smooth Muscle
of Muscularis
Circular
Smooth
Muscle of
Muscularis
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Trigone of
Bladder
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Urethra (Y-shaped) runs through Prostate Gland of Male
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Subcutaneous A&V
Corpus Cavernosa
Corpus Spongiosa
Urethra
Human Penis CS