Session 10 A Embryology Flashcards
Describe the 3 sets of excretory organs
Pronephros
Mesonephros and duct
Metanephros
Features of the development of the kidney system
Organisation of intermediate mesoderm
3 systems develop sequentially
Disappearance of one system marks the onset of development of the next developmental stage
1st kidney system forms in the
Cervical region
The Pronephros
What are these
Intermediate mesoderm goes on to form
Pronephros
Mesonephros
Metanephros
What day does the intermediate mesoderm start to form the primitive kidney system
Day 28, pulls down
Importance of Pronephros
First kidney system, never functions in humans
Pronephric duct extends from the cervical region to the cloaca, drives the development of the next stage (Mesonephros)
Mesonephric ducts develop caudal to the
Pronephric region
Embryonic kidney is made up of
Mesonephric tubules and duct
What is lacking in the Mesonephros
No water conserving function
Why do we need to know about the Mesonephros
Important in development of male reproductive system
Spouts the ureteric bud which induces development of the definitive kidney
What forms Metanephros
Undifferentiated intermediate mesoderm, caudal to the Mesonephros
Ureteric bud induces development of the true kidney, Metanephros in this tissue
What does this show
What drives the development of the definitive kidney
Ureteric bud