Embryology Flashcards
What is the allantois?
Outpouching of endoderm at the hindgut that extends into the body stalk
What is a cloaca?
The single posterior opening for a birds digestive, urinary and repreouctive tracts
What does the cloaca divide to form?
Rectum and the urogenital sinus
What does the urogenital sinus form?
The urinary bladder and the urethra
At week 4 what does the intermediate mesoderm form and where?
The pronephros in the neck region and the
Mesonephros in the trunk region
What is the pronephros made of?
Pronephric duct and rudimentary pronephric tubules
Where does the pronephric duct drain?
Into the cloaca
What does the pronephric duct become with the mesonephros develops?
The mesonephros duct
Where do the mesonephric tubules drain?
Mesonephric duct
What week does the metanephros start to develop?
About week 5 and starts to function around week k9
What does the metanephros consist of?
A ureteric bud that develops off the mesonephric duct, metanephric mesoderm
What happens to the mesonephros?
It is incorporated into the developing gonad
In a male what does the mesonephric tubule become?
Rete testis
In a male what does the mesonephric duct become?
The vas deferens
In a female what do the tubules and mesonephric ducts become?
They degenerate but the mesnephros become the ovary
