Development of the renal system Flashcards
The growth of what structure separates the cloaca into the bladder and rectum?
urorectal septum
The yolk sac forms as the embryo rolls up and it links to the midgut, what will this become?
This will become the choriovitelline placenta.
Allantoic sac forms as an outgrowth of the hindgut what happens to the root of it? And the rest?
The root attaching to the gut becomes divided by the urorectal septum to create the hindgut and the bladder. The allentoic sac Becomes the chorioallantoic placenta.
What are the three segments of the mesoderm?
- Paraxial mesoderm
- Intermediate mesoderm
- Lateral plate mesoderm
a. Splanchnic mesoderm
b. Somatic mesoderm
What part of the mesoderm develops into the nephros?
Intermediate mesoderm
What does the intermediate mesoderm develop into?
The intermediate mesoderm develops three bilaterally symmetrical sections, from cranial to caudal, connected to the coelomic cavity:
Pronephros.
Mesonephros.
Metanephros.
In fish what do the three sections of the intermediate mesoderm develop into?
Pronephros, replaced by mesonephros.
Mesonephros has both reproductive and excretory elements in these animals.
No metanephros.
In reptiles, mammals and birds what do the three sections of the intermediate mesoderm develop into?
Pronephros atrophies.
Mesonephros regresses to form gonads and adrenal cortex.
Metanephros develops to become the functional kidney.
In the embryo the blood supply to the kidneys comes from…
Branches from dorsal aorta.
Paired for metanephros.
Stimulates formation of nephric tubules.
Before it atrophies the pronephros is well developed in what species?
Pigs
What stimulates the formation of nephrons?
The invasion of the ureteric duct into the metanephros
In the final kidney what does the mesoderm form and what is formed from the mesoderm?
The Mesoderm forms:
Bowman’s capsules.
Proximal convoluted tubules, loops of Henle and distal convoluted tubules.
The Ureteric duct forms:
Collecting ducts.
Renal pelvis.
Ureter.
The mesonephric ducts in males develop into what?
Seminiferous tubules
The mesonephric tubules in males develop into what?
Ductus deferens
What are ectopic ureters?
One or both ureters enter the urethra/vagina downstream of the bladder sphincter
