Sistem Urinari E
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Transcript of Sistem Urinari E
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Anatomy of the Urinary System
Institut Pendidikan GuruKampus Perempuan Melayu
PJM3106
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Urinary System Organs
Kidneys
Urinary bladder:providesa temporary storagereservoir for urine
Paired ureters: transporturine from the kidneys to
the bladder Urethra: transports urine
from the bladder out of
the body
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Kidney Location and
External Anatomy
The bean-shaped kidneys lie in a
retroperitonealposition in the superior
lumbar region and extend from the twelfth
thoracic to the third lumbar vertebrae
The right kidney is lowerthan the left
because it is crowded by the liver
Ureters, renal blood vessels, lymphatics,
and nerves enter and exit at the hilus
(medial border)
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Kidney
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Kidney Blood Flow
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Kidney:
Internal Anatomy
Renal Capsule
Cortex
Renal medulla
Columns
Pyramids
Renal pelvis Major calyx
Minor calyx
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Nephron
Nephrons are the structural and functional units thatform urine, consisting of:
1. Renal Corpuscle:The collective term for the
glomerulus and the surrounding capsule Glomerulus:Tuft of capillaries
Bowmans capsule:Enlarged end of the renaltubule that surrounds the glomerulus
2. Renal Tubule: Tube into which fluid passes
Proximal convoluted tubule
Loop of Henle
Distal convoluted tubule
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Nephron
Cortical Nephrons: 80-85% of all nephrons
Their renal corpuscles lie in the outer portion ofthe renal cortex
Have short loops of Henle Lie mainly in the cortex
Penetrate only into outer region of the renal medulla
Juxtamedullary nephrons: 15-20% of nephrons
Renal corpuscle lies deep in cortex near medulla
Have long loops of Henle
Responsible for creating medullary concentrationgradient that allows the kidney to change dilution ofurine
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Nephron
Gl l
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Glomerulus
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Glomerulus
The primary filtering device of the nephron
Blood is transported into the Bowman's
capsule from the afferent arteriole Within the capsule, the blood is filtered
through the glomerulus and then passes out
via the efferent arteriole. Filtered water and aqueous wastes are
passed out of the Bowman's capsule into the
proximal convoluted tubule.
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Glomerulus
These renal tubules will then flow alongside
the peritubular capillaries
Most of the water that was originally forcedout is reabsorbed from the renal tubules
back into these blood vessels.
Whatever water remains in the renal tubuleswill be urinated away.
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Nephron Vasculature
Consists of 2 capillary beds separated by the
intervening efferent arteriole.
The 1st capillary bed (the glomerulus)produces the filtrate
The second capillary bed (peritubular
capillaries) reclaims most of that filtrate Vasa recta- bundles of long straight vessels
that run beside the loops of Henle deep into
the medulla.
C ti l
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Interlobular Artery
Interlobular Vein
Arcuate
Artery
Afferent
Arteriole
Efferent
Arteriole
Peritubular
capillaries
Glomerulus
Cortical
Nephron
Vasculature
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Juxtamedullary
Nephron
Vasculature
Vasa Recta
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Nephron Vasculature
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Macula Densa
There is a portion of the DCT that abuts the
afferent arteriole. At that region of the DCT,
there are tall, closely-packed DCT cells that
collectively are known as the macula densa.
Macula densa cells are chemoreceptors that
are responsible for measuring filtrate Na+
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Juxtaglomerular Cells
In the afferent arteriole where the DCT istouching, there are specialized smoothmuscle cells known asjuxtaglomerular
cells. Act as mechanoreceptors
These JG cells contain large amounts of
secretory granules containing renin When blood pressure low, the JC cells
release their renin
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Glomerulus
Hi t l f R l T b l &
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Histology of Renal Tubule &
Collecting Duct
Proximal convoluted tubule
Simple cuboidal with brush border of microvillithat increase surface area
Descending limb of loop of Henle Simple squamous
Ascending limb of loop of Henle
Simple cuboidal to low columnar Distal convoluted & collecting ducts
Simple cuboidal composed of principal &intercalated cells which have microvilli
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Kid
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Kidney
Histology
Kid
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Kidney
Histology
Kid
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Kidney
Histology
Kid Hi t l
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Kidney Histology
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Bladder
It lies retroperitoneallyon the pelvic floor
posterior to the pubic symphysis
Males: Prostate gland surrounds the neck
inferiorly
Females: Anterior to the vagina and uterus
The bladder wall has three layers
Transitional epithelial mucosa
A thick muscular layer
A fibrous adventitia
Ureter OpeningsUreter
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Female
Bladder
Ureter OpeningsUreter
Trigone
External
Urethral
Sphincter
Urogenital Diaphragm
Internal Urethral Sphincter
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Ureter Openings
TrigoneInternal Urethral
Sphincter
External Urethral
Sphincter
Ureter Male
Bladder
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Bladder Histology
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Bladder Histology
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Urethra
The female urethra is tightly bound to theanterior vaginal wall
Its external opening lies anterior to the
vaginal opening and posterior to the clitoris
The male urethra has three named regions
Prostatic urethra: runs within the prostate gland
Membranous urethra: runs through theurogenital diaphragm
Spongy (penile) urethra: passes through thepenis and opens via the external urethral orifice
Male
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Male
Urethra
Spongy (penile)
urethra
Membranous urethra
Prostatic urethra
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The End