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Flashcards in Embryology Deck (27):
1

What germ layer gives rise to the kidney

Intermediate mesoderm

2

What do the pronephros become in adults life

Nothing - remnants in adult life

3

What is the ultimate function of the mesonephric duct

It connects where the bladder is going to develop

4

What happens to the segments of the mesonephros during development

As development goes on, the more cranial parts begin to regress and degenerate and disappear

5

The mesnephros connect with two areas of the embryo. What are these

Vasculature
Developing bladder

6

How many mesonephric tubes are produced

40

7

When do the mesonephric tubules regress. How many left and where are they situated

End of Week 5 leaving 20 at L1-L3

8

What do the mesonephros differentiate into and when.

Excretory units
Between weeks 6-10

9

What do the mesonephros act as during weeks 6-10

Kidneys - producing a filtrate but waste is removed via the placenta

10

When do the metaphors appear

Week 5

11

What do the metaphors become

The permanent kidney

12

What do the metaphors form from

Ureteric Bud and Metanephric Blastema

13

What is the ureteric bud

The communication to allow urine to pass to the bladder from the kidney

14

Where do the ureteric buds sprout form and when

distal mesonephric ducts
Day 28

15

What do the ureteric buds penetrate and when

portion of aural intermediate mesoderm
Day 32

16

What happens if there is no contact between the ureteric bud and the metanephric meenchyme

You can't form a kidney

17

What happens if there is a failure of the ureteric bud to meet the metanephric mesenchyme bilaterally

Not compatible with life as there is no mechanism for filtering the blood

18

What does the ureteric bud go on to form

the collecting system

19

What forms the nephron

metanephric Blastema

20

What shape does the nephrite vesicle take on

S shape

21

When do the kidneys attain their adult position

About week 9

22

What happens to the blood vessels that supplied the kidneys before they ascended

They degenerate as they are no longer needed. These are more caudal

23

What happens if the kidneys move up but the caudal arteries do not degenerate

We end up with accessory renal arteries

24

What does the Cloaca divide into

A posterior structure (Rectum) and an anterior structure (Primitive urogenital sinus)

25

What forms from the primitive urogenital sinus

Bladder
Pelvic Urethra
Definitive urogenital sinus

26

Where is the non-muscular part of the bladder formed form

Neonephric ducts

27

Name some bladder defects that can occur in embryological development

Urachal fistula
Urachal cyst
Urachal sinus