Introduction Gross Anatomy and Histology of the Urinary System Flashcards
What is the urinary system composed of?
Kidneys
Ureters
Urinary bladder
Urethra
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What are some functions of the urinary system?
- Removes metabolic waste from blood by filtration and excretion
- Regulates plasma electrolytes and blood pressure (by renin-angiotensin mechanism)
- Helps to stabilise the pH
- Reabsorption of small molecules (amino acids, glucose and peptides)
- Produces erythropoietin (a stimulant of RBC production by bone marrow
By what mechanism does the urinary system regulate plasma electrolyte and blood pressure?
Renin-angiotensin mechanism
By what processes does the urinary system remove metabolic waste from blood?
Filtration and excretion
What are some examples of small molecules that the urinary system reabsorbs?
Amino acids
Glucose
Peptides
What is erythropoietin?
Stimulat of RBC production by bone marrow
Are the kidneys retro or intraperitoneal structures?
Retroperitoneal
Between what spinal levels do the kidneys lie?
T12-L3
Do the kidneys lie level to each other? If not, why is this?
Right kidney is slightly lower than left kidney due to liver
Are the kidneys fully or partially peritonised?
Partially peritonised
What are some of the anterior relations of each kidney?
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What are some of the posterior relations of each kidney?
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What nerves run posterior accross each kidney?
Iliohypogastric nerve
Ilioinguinal nerve
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Describe the structures surrounding the actual kidney from superficial to deep?
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What is A?
Cortex
What is B?
Medulla
What ic C?
Pyramid (10-18)
What is D?
Papilla
What is E?
Minor calyx
What is F?
Major calyx
What is G?
Pelvis
What is H?
Ureter
What is I?
Renal lobe
What is the arrangement of the artery, vein and pelvis from anterior to posterior of the kidney?
Vein, artery then pelvis (remember VAP)
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What does the renal arteries branch from?
Abdominal aorta
What do the renal arteries branch into?
- Segmental branches (x5)
- Interlobar
- Arcuate
- Branches pass around the circumference
- Interlobular
- Branches which ultimately supply each nephrone
- So is non-anastomosing
What do the renal veins drain into?
Inferior vena cava
What is the lymphatic drainage of the kidneys?
Lateral aortic lymph nodes
What is the plexus called that innervates the kidneys?
Renal plexus
What supplies the renal plexus?
- Sympathetic T10-L1
- Sensory afferent T11-L2
What is the urinary bladder composed of?
- Median umbilical ligament
- Embryonic urachus
- Two medial umbilical folds
- Occluded umbilical artery
- Two lateral umbilical folds
- Inferior epigastric vessels
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What embryological structure forms the median umbilical ligament?
Embryonic urachus
How is the bladder peritonised?
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What are the different parts of the male urethra?
Intramural
Prostatic
Intermediate
Spongy
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Describe the nervous innervation of the bladder?
What part of the male urethra recieves the ejaculatory duct?
Prostatic urethra
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What is the medical term for the action of urinating?
Micturition
What is the functional unit of the urinary system?
Nephron
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What is the uriniferous tubule composed of?
Nephron and collecting duct
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What is the nephron composed of?
Renal corpuscles and renal tubules
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What is the renal corpuscles composed of?
Glomerulus and bowmen’s capsule
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What is A?
Kidney - cortex
What is B?
Kidney - medulla
What is C?
Ureter
What is D?
Bladder
What is the class of the epithelium in the collecting tubules of the kidneys?
Cuboidal
What is the class of the loop of Henle epithelium in the kidney medulla?
Squamous epithelium
What is the class of the ureter epithelium?
Transitional epithelium
How is the lumen of the ureters shaped?
Star shaped
What muscles are in the wall of the ureters?
Inner longitudinal smooth muscle
Outer circular smooth muscle
What is the classification of epithelium in the bladder?
Transitional epithelium
What muscles are in the wall of the bladder?
Inner longitudinal smooth muscle
Middle circular smooth muscle
Outer longitudinal smooth muscle
What are some common diseases of the urinary system?
- Urinary tract infection (UTI)
- Glomerulonephritis
- Kidney stone/renal calculi
- Kidney failure and dialysis
- Urinary incontinence
- Common after childbirth/old age/in female
What does UTI stand for?
Urinary tract infection
What are some important markers of kidney disease?
- High protein (albumin) levels in urine
- Proteinuria
- Glomerular filtration rate (GFR)
- Increased level of serum creatinine/urea
What is the medical term for high protein in urine?
Proteinuria
What does GFR stand for?
Glomerular filtration rate
What are some common congenital abnormalities of the urinary system?
Aberrant renal arteries
Horseshoe kidney
Pelvic kidney
Unilateral double kidney
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