Flashcards in Urogenital Deck (69)
Where is the urogenital ridge found?
in the dorsal part of the embryologic kidney
What are the 3 attempts to make the kidney called?
pronephros mesonephros metanephros
Where does the pronephric attempt occur?
most cranial attempt; in the neck
What does the pronephric attempt become?
the mesonephric duct
How does the mesonephros attempt of the kidney degrade?
once it reaches its maximum size, it degenerates from cranial to caudal
How many tubules of the pronephric attempt form a duct?
seven to eight
What is another name for the mesonephric duct?
How many tubules of the mesonephric attempt form a duct?
In amphibians and fish, which attempt becomes the adult kidney?
What is the metanephros?
the attempt of kidney creation that becomes the adult kidney
What structures create the adult kidney?
the metonephric diverticulum and the metonephrogenic mass
Where is the metonephric diverticulum located?
comes off of the mesonephric duct
What does the metonephric diverticulum differentiate the surrounding mesoderm into?
the metanephrogenic mass
What does the metanephrogenic mass give rise to?
the urine conducting part of the kidney (functional unit)-ureter, renal pelvis, calyxes and collecting ducts
How are nephrons formed?
metanephric diverticulum causes areas within the metanephrogenic mass to differentiate into renal vesicles which will transition into metanephric tubules which creates nephrons
What cases variations in kidneys between species?
the differences between interactions of the metanephrogenic mesenchyme and the metanephric diverticulum
What does the bladder develop as an extension of?
the urachus and the cranial end of the urogenital sinus
What does the urogenital sinus become in the male?
pelvic urethra and penile urethra
What does the urogenital sinus become in the female?
pelvic urethra, vestibule and the caudal vagina
In early development, what does the mesonephric duct go into?
it goes directly into the bladder
What does the mesonephric duct become in the adult?
the ductus deferens in males
What does the metanephric diverticulum become in the adult?
the ureter, pelvis, calyces, papillary ducts, and collecting tubules
How does the mesonephric duct and the metanephric diverticulum become in the correct places that they should be in the adult?
the bladder grows dorsally so that the future ureter and ductus deferens empty into it separately, and then differential growth causes them to switch places so that the ureter empties into the bladder and the ductus deferens empties into the urethra
the kidney could be sitting in the pelvic cavity
when the urachus does not close right after birth and urine still flows through the allantoic cavity
when the ureter is not opening in the correct location
What structure gives rise to male structures?
What structure gives rise to female structures?
What suppresses the paramesonephric duct in males?
the mullerian inhibiting substance and testosterone