Embryology: The GU System Flashcards
What tissue does the urogenital system develop from?
Mesoderm - the intermediate mesenchyme
Which of these is the first system to arise?
Urinary System
What is the ureteric bud an outgrowth of?
Mesonephric Duct
When do the external gonads acquire feminine/masculine features?
12th week
What are the 3 kidney systems in the embryo?
Pronephros
Mesonephros
Metanephros
What is the fate of the pronephros?
Regresses
What is the fate of the mesonephros?
Mesonephric Tubules - excretory organs and the vas deferens in males
Mesonephric Ducts - gives the ureteric bud & trigone
What is the fate of the metanephros?
Results in the permanent kidney
Ureteric bud - ureter, renal pelvis, calices & collecting tubules.
Metanephrogenic blastema - the nephrons (the functional unit of the kidney).
What are the 3 parts of the urogenital sinus?
Vesical - bladder
Pelvis - urethra
Phallic - penis/clitoris
What is exstrophy of the bladder?
It results from a rare ventral body wall defect through which the posterior wall of the urinary bladder protrudes onto the abdominal wall
What is epispadias?
The urethra opens on the dorsum of the penis
What forms the urachus?
The intraembryonic part of the allantois constricting
