Embryology of Urinary System Flashcards Preview

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Flashcards in Embryology of Urinary System Deck (34):
1

When does the urinary system form?

week 4

2

What are the two parts of the urogenital system?

1. Urinary system
2. Genital system

3

From what tissue does the urogenital system originate?

intermediate mesoderm

4

T/F there are two slightly overlapping kidney systems?

False- there 3

5

What are the three kidney systems and what is their purpose?

Pronephros- rudimentary, nonfunctional
Mesonephros- function for a short time during early fetal period
Metanephros- forms the permanent kidney

6

When does the pronephros appear and degenerate?

Appears- day 21
Degenerates- day 24

7

When does mesonephros appear?

early week 4- usually when the pronephros degenerates

8

Where does the mesonephros develop/appear?

thoracic and lumbar segments of intermediate mesoderm

9

In week _ the thoracic segments regress but the mesonephric kidney continues to function until week __.

5
10

10

Urine travels from the mesonephros to the ____ via the ____ ____.

cloaca via the wolffian (mesonephric) duct

11

In which direction does canalization take place?

Caudally to cranially

12

Canalization initiates what?

The ureteric bud/metanephric diverticulum growth

13

What day does the collecting portion- the ureteric bud- occur?

day 28

14

The ureteric buds induce what?

the formation of metanephric blastema, which forms the glomeruli and tubules of the nephrons

15

What happens if there is no ureteric bud? What about extra ones?

Kidney doesn't develop
Supernumerary kidneys

16

The stalk of the ureteric bud becomes what?

The ureter

17

The kidneys ascend, T/F

Truth!

18

When do the kidneys ascend?

Weeks 6-9

19

Initially they kidneys form near the _____ ___ of the embryo.

caudal end

20

Kidneys initially have their blood supply from the common iliac arteries. What happens during the ascent of the kidney?

New arteries will enter the hilum of the kidney

21

As kidneys ascend, do they drag their blood supply with them?

Nope, new vessels come in as the old ones degenerate

22

Pelvic kidney is the result of what?

The kidney doesn't ascend- ectopic kidney

23

Horseshoe kidney is a result of what?

The kidneys fusing together and running into the IMA, so it's a little lower

24

Supernumerary arteries of the kidney are a result of what?

... it's fairly common, no big deal, as long as one of the extra arteries doesn't push on the ureter

25

The cloaca in the hindgut becomes divided by the _____ ____.

Urorectal septum

26

The urorectal septum turns the cloaca into what two areas?

1. Ventral urogenital sinus
2. Dorsal anorectal canal

27

The bladder forms from what portion of what?

The vesical portion of the urogenital sinus

28

The urethra comes from what part of what?

The pelvic part of the urogenital sinus

29

The distal portions of the mesonephric ducts and the attached ureteric ducts become incorporated into what?

The posterior aspect of the bladder

30

The spongy part of the urethra come from the ____ part of the urgogenital sinus

phallic

31

When the allatois is closed off/obliterated proximally, what is the obliterated part called?

The urachus

32

What is a urachal cyst?

Part of the allantois is closed off, then its open for a small pocket, and then it's regular

33

What's a urachal sinus?

It's where the allantois is open and can drip urine out

34

What's a urachal fistula?

It's not a sinus and it's not a cyst, but it's kinda like the allantois was never obliterated- there is no urachus