Development of urinary system and reproductive system
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Development of Urinary system and reproductive 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. 3rd week:

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Development of Urinary system and reproductive system

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Development of Urinary system and reproductive 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


3rd week:

HeadsegmentationNephrotome →

Intermediate Pronephros

Mesoderm

Other migration, proliferation Nephrogenic cord

→ Mesonephros and Metanephros


Mesonephric ridge

Urinary system,

Genital excurrent ducts

Gonadial ridge

Gonad

Intermediate mesoderm

3rd week

Nephrogenic cord

Urogenital ridge

Intermediate mesoderm

─────→

───→

───

Pudendum


Mesonephric ridge

Urogenital ridge

Gonadial ridge


Mesonephric ridge

Gonadial ridge


Pronephric duct

Pronephric tubule

Development of urinary system

1. Pronephros 4th week

Development of kidney and ureter

Nephrotome (7-14th Somite)

Degeneration in 1 week

Mesonephric

duct


Pronephric

tubule

Pronephros

Time:4th week

Function:no

Destiny: degeneration


2. Mesonephros 14-18th somite

Middle part of nephrogenic cord

80 transverse S-shaped tubule

Mesonephric tubule

Mesonephric duct

Continus to pronephric duct

Inner end form renal capsule

Glomerulus

Outer end bind to mesonephric duct

The end bind to cloaca


Time:

end of 4th week

Function:

transient urinary

Destiny:

Most degeneration,

Small part form male excurrent duct

Mesonephric duct

Mesonephric tubule


3.Metanephros

  • Time:begin at 5th week,

  • exist forever

  • Function:begin at 3th month,

  • urinary function

  • Position:rise gradually

Metanephros


End of mesonephric duct

(adjacent to cloaca)

Origin

one

Ureteric bud

Prolong

Ureter

Embranchment >12

Renal pelvis, renal calyce

(The end branched as T)

Collecting tube


Origin

two

(Mesoderm of the mesonephric ridge)

Metanephrogenic blastema

Cap-shaped cell cluster

S-shaped tubule

Bind to collecting tubule

Renal capsule

Glomerulus

+

Renal tubule

Renal corpuscle

Nephron


Metanephrogenic blastema

Mesonephric tubule

Collecting tubule

Renal pelvis

Renal calyce

Ureteric bud


Formation and rising of metanephros


Male

Female

Upper:

Urinary bladder

Urinary bladder

Urogenital sinus

Upper part

of urethra

Urethra

Middle:

4-7th week

Urorectal septum

Lower part

of urethra

Vestibule of vagina

Lower:

Anorectal canal

Development of urinary bladder and urethra

Cloaca


Evolvement of male urogenital sinus

A

B

E

C

D


Positional evolvement of

UreterandMesonephric duct

Ureter

Mesonephric duct


Abnormality

  • Double ureter

  • Urachal fistula

  • Exstrophy of bladder

  • Polycystic kidney

  • Horseshoe kidney

  • Single kidney


Polycystic kidney


Horseshoe kidney


Single kidney

Right single kidney

Left single kidney


Ectopic kidney


Double ureter

Ureter


Urachal fistula


Exstrophy of bladder


Development of gonad

Gonad differentiation at 7th week

Developmental stage:

Sex undifferentiated stage→ Sex differentiated stage

Reproductive tracts:2 → 1

Proper current: → Feamle


Endoderm cells of yolk sac

4th week

Proliferation, differentiation

Primordial germ cells

Migration in one week

6th week

6th week

Gonadial ridge

Primary sex cord

Superficial epithelium →cell cords

1.Development of

undifferentiated gonad

Development of gonad


Primordial germ cells

Large and round endoderm cells in yolk sac


Migration of primordial germ cells

6th week


Histocompatibility Y antigen

  • H-Y antigen determine the differentiation to testis

    The gene of H-Y antigen located at Y chromosome

    The cell membrane of the cell which sex chromosome

    is XY possesses H-Y antigen

  • Primary sex cord H-Y antigen proliferation

    seminiferous tubule


Mesenchymal cell

Primordial germ cells

Cells of sex cord

Spermatogonium

Sustantacular cell

Interstitial cell

2. Development of testis

Primary sex cord (H-Y antigen)

7th week

Separated from surface

+

+

Testis


Secondary sex cord (cortical cord)

16th week

Mesenchymal cells

Primordial follicle

Ovary

Stroma

3. Development of ovary

Superficial epithelium

Primary sex cord

(No H-Y antigen)

After 10th week

Degeneration

Primordial germ cells

Cells of sex cord

+

+

Oogonium

Follicular cells


Ovary

Testis

Rete testis

Tubule rectus

Follicle

Seminiferous

tubule

Spermatogonium

Primaryoocyte

Sustantacular cell

Follicular cell

Follicle

Seminiferous tubule


4. Descend of testis

and ovary

Embryo →lengthen

Gubernaculum →shorten

7th to 8th month → Scrotum


Development of reproductive tracts

1. Undifferentiated stage:


2. Differentiation of female reproductive tract

End of upper segment:Fimbria

Upper and middle segment:oviduct

Lower segment:Uterus

End:Vaginal fornix

Paramesonephric duct:

Sinus tubercle:

Vaginal plate Vagina

Mesonephric ducts and tubules

Degeneration


3. Differentiation of male reproductive tract

Head ── Epididymal duct

Tail ── Spermaduct

Metanephric duct

Most of →degeneration

Some of → Efferent ducts

Mespnephric tubules

Paramesonephric duct

Degeneration


Abnormality of reproductive system

1. Cryptorchidism

2. Congenital inguinal hernia

3. Double uterus

4. Vaginal atresia

5. Hypospadias

6. Hermaphroditism


Cryptorchidism


Congenital inguinal hernia


Double uterus


Vaginal atresia


Hypospadias


Hermaphroditism


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