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Development of urogenital system. 1. Development of kidney and ureter 2. Development of urinary bladder and urethra 3. Abnormality in urinary system 4. Development of gonad 5. Development of reproductive tracts 6. Abnormality in reproductive system. Urinary system,

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slide1
Development of urogenital system

1. Development of kidney and ureter

2. Development of urinary bladder and

urethra

3. Abnormality in urinary system

4. Development of gonad

5. Development of reproductive tracts

6. Abnormality in reproductive system

slide2
Urinary system,

genital excurrent duts

Mesoneohric ridge

Gonadal ridge

Gonad

Intermediate mesoderm

3rd week

Urogenital ridge

Nephrogenic cord

Intermediate mesoderm

───→

─────→

Primordium of urogenital system

───

Intermediate mesoderm

slide3
Head (segmentation)→ Nephrotome →Pronephros

Other (migration, proliferation)→ Nephrogenic cord →

Mesonephros and Metanephros

Urogenital ridge

slide4
Mesonephric ridge

Gonadal ridge

slide5
Mesonephric ridge

Gonadal ridge

slide6
Pronephric duct

Pronephric tubule

Degeneration in 1 week

Mesonephric duct

Development of kidney and ureter

1. Pronephros

4th week, no function

Pronephric

tubule

Nephrotome (7-14th somite)

Pronephric

duct

slide7
2. Mesonephros

14-18th somite

Time:

end of 4th week

Function:

transient urinary

Destiny:

Most degeneration,

Small part form male

excurrent duct

Mesonephric duct

Mesonephric tubule

slide8
Middle part of nephrogenic cord

80 transverse S-shaped tubule

Mesonephric tubule

Mesonephric duct

Continus to pronephric duct

Inner part form renal capsule

Outer end bind to mesonephric duct

End bind to colaca

slide9
3.Metanephros

Source one:

Ureteric bud

Source two:

Metanephrogenic

blastema

Time:

begin at 5th week,

exist forever

Function:

begin at 3th month,

urinary function

Position:

rise gradually

Mesonephric duct

Mesonephric tubule

Metanephros

slide10
End of mesonephric duct

(adjacent to colaca)

Source one

Ureteric bud

Prolong

Ureter

Enbranchment>12

Renal pelvis, renal calyce

(The end branched as T)

Collecting tube

slide11
Source two

Cap-shaped cell cluster

S-shaped tubule

Connect with collecting tubule

Renal capsule

Glomerulus

Renal tubule

Renal corpuscle

Nephron

Metanephrogenic blastema

(Mesoderm of the mesonephric ridge)

Metanephric tubule

slide12
Collecting tubule

Mesonephric tubule

Metanephrogenic blastema

Ureteric bud

Renal pelvis

Renal calyce

slide13
From its original location (adjacent to the developing baldder) to its mature location (in the retroperitoneum just caudal to the diaphragm)
slide14
Male

Female

Upper part

Urinary bladder

Urinary bladder

Upper part of urethra

Urogenital sinus

Middle part

Urethra

4-7th week

Lower part

Lower part of urethra

Vestibula of vagina

Ureorectal septum

Anorectal canal

Development of

urinary bladder and urethra

Colaca

slide15
A

B

E

D

C

slide16
Ureter

Mesonephric duct

slide17
Abnormality in urinary system

2. Horseshoe kidney

1. Polycystic kidney

slide18
3. Single kidney

Right single kidney

Left single kidney

slide19
5. Ectopic kidney

4. Double ureter

slide20
7. Exstrophy of bladder

6. Urachal fistula

slide21
Development of gonad

Gonad differentiation at 7th week

Developmental stage:

Sex undifferentiated stage → Sex differentiated stage

Reproductive tracts:2 → 1

Proper current: → Feamle

Testis determining factor, TDF

TDF determine the differentiation to testis.

The gene of TDF located at sex determining region of the Y (SRY).

slide22
Endoderm cell of yolk sac

Proliferation differentiation

3rd to 4th week

Promordial germ cells

Migration in 1 week

6th week

6th week

Gonadal ridge

Primitive sex cord

Superfacail epithelium →cell cord

  • Development of
  • undifferentiated gonad
slide23
Promordial germ cells

Large and round endoderm cells in yolk sac

slide24
Dorsal mesentary of the gut

Migration of promordial germ cells

slide25
Seperated from surface

7th week

Seminiferous tubule

Mesenchymal cells

Cells of sex cord

Promordial germ cells

Spermatogonium

Interstitial cells

Sustantacular cells

Testis

2. Development of testis

Primary sex cord(TDF)

slide26
Superfacial epithelium

No TDF

Primary sex cord

After 8 weeks

Secondary sex cord (Cortical cord)

16th week

Degeneration

Mesenchymal cells

Primordial follicel

Primordial germ cells

Cells of sex cord

Ooginum

Stroma

Follicular cells

Ovary

3. Development of ovary

slide28
Ovary

Testis

Rete testis

Tubule rectus

Follicle

Seminiferous tubule

Spermatogonium

Primary oocyte

Sustantacular cell

Follicular cell

Follicle

Seminiferous tubule

slide30
Development of reproductive tracts

1. Undifferentiated stage

slide31
2. Differentiation of male reproductive tract

Proximal part ── epididymal duct

Distal part── ductus deferens and ejaculatory duct

Mesonephric duct

Most of ── degeneration

Some of ── efferent ducts

Mesonephric tubule

Paramesonephric duct

Regression

──

slide32
3. Differentiation of female reproductive tract

Upper and middle segment:oviduct

Lower segment: uterus

Paramesonephric duct

Vagina

Sinus tubercle:

Vaginal plate

Mesonephric duct and tubule

regression

slide35
2. Congenital inguinal

hernia

3. Double uterus

slide36
4. Vaginal atresia

5. Hypospadias

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