Urinary dev

Question 1

Tissue sources of urinary system (2)

Answer 1

1. Intermediate mesoderm - kidney and ureter

2. Cloaca - bladder and urethra

Question 2

Order of tissue dev for kidney and uteter

Answer 2

intermediate mesoderm>nephrogenic cord>3 phase of dev

Question 3

3 phases of nephrogenic cord development and time frame

Answer 3

1. Pronephric - week 3-4
2. Mesonephric - week 4 to month 4
3. Metanephric - week 5 -

Question 4

Direction of kidney dev.

Answer 4

Cranial>cuadal

Question 5

Features of pronephric phase

Answer 5

cavitieis form in cord and move caudally

Question 6

feat. of mesonephric phase

Answer 6

tubules begin to form into duct opposite lumbar area

Question 7

feat. of metanephric phase

Answer 7

ureteric bud appears and become uerteric mass

Question 8

derivatives of uretics bud

Answer 8

urine collecting system - calyxes, urteres, pelvis,

Question 9

derivatives of metanephric mass

Answer 9

urine producing system - nephrons etc

Question 10

4 problems of comm between metanephric mass and ureteric bud

Answer 10

1. bifid ureter
2. supernumerary kidney (2 widely sep. urerters)
3. crossed renal ectopion (both kidney on one side)
4. renal agenisis

Question 11

direction of kidney migration

Answer 11

up and medial rotation

Question 12

3 problems with kidney ascent

Answer 12

1. accessory renal arts.
2. ectopic kidney (doesn’t ascend)
3. fused kidney (attached to each other)

Question 13

Fetal contributions to stasis of amnitoic fluid

Answer 13

Drinking it and peeing it

Question 14

Steps of bladder dev.

Answer 14

1. Urogenital sinus appears
2. mesonephric duct enters lat. and allantois enters sup.
3. sinus fills with urine and expands
4. as kidney ascend pulls mesonephric ducts up into ureters
5. Allantois degrades into urachus

Question 15

when bladder opens onto body cavity

Answer 15

bladder extrophy

Question 16

Time pronephric duct begins and degenerates

Answer 16

3 weeks and 4 weeks

Question 17

time of mesonephric duct begin and degenerate

Answer 17

4 weeks to 4 months

Question 18

time that ureteric bud appears

Answer 18

5th week

Question 19

Problems of amounts of amniotic fluid

Answer 19

1. Too much - polyhydramnios

2. Too little - ogliohydramnios

Question 20

problems with allantois closing

Answer 20

patent urachus

Question 21

what allantois becomes

Answer 21

urachus- median umbilical ligament

Question 22

time of kidney accent

Answer 22

9th week

Question 23

divisions of urorectal septum

Answer 23

urogenital sinus and dorsal rectum

Question 24

tissue source of bladder

Answer 24

cranial part of urogenital sinus

Question 25

what induces ureteric bud to branch and connect

Answer 25

metanephric mass