Urinary System Development Flashcards
The proximal male urethra is formed from what?
The urogenital sinus (endoderm)
The distal male urethra is derived from what?
Ectodermal cord (ectoderm)
What is the female urethra derived from?
Urogenital sinus
What embryological layer gives rise to the urogenital ridge?
Intermediate mesoderm
The urogenital ridge develops into what?
Nephrogenic ridge (gives rise to urinary system) and gonadal ridge (gives rise to genital system)
The mesonephric duct gives rise to what in only the male?
Ductus deferens
What is the ductus deferens derived from?
Mesonephric duct
The mesonephric duct gives rise to what in both the male and female?
Ureteric bud
What does the ureteric bud grow into? What does this cause?
Grows into the intermediate mesoderm, initiating formation of the metanephros
What is derived from the ureteric bud?
Ureter, renal pelvis, renal calyces, and collecting duct (tubules)
The nephron arises from what?
Intermediate mesoderm
Renal agenesis with an absent ureter results from what?
Failure of ureteric bud and metanephric mesoderm to interact
Male neonate is delivered and only a single umbilical artery is seen, what is suspected?
Renal agenesis
The urorectal septum is derived from what embryological layer?
Mesoderm
What does the urorectal septum divide?
The cloaca (endoderm) into the rectum and urogenital sinus
What part of the urogenital sinus forms the bladder?
Vesicle part
The urogenital sinus is continuous with what?
The allantois
What does the allantois form?
Urachus, that later becomes the median umbilical ligament
The medial umbilical ligament is a remnant from what embryonic structure?
Urachus
The pelvic (middle) part of the urogenital sinus gives rise to what?
Bladder neck and prostatic urethra in the male, and the entire urethra in the female
The trigone of the bladder is formed by tissue from what?
The mesonephric duct
Epithelium o the entire bladder is derived from what?
Endoderm of the urogenital sinus
Connective tissue and smooth muscle of the urinary bladder is derived from what?
Splanchnic (visceral) mesenchyme (mesoderm)
Connective tissue and smooth muscle from the urethra is derived from what?
Splanchnic (visceral) mesenchyme (mesoderm)