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Diagnostic ultrasound ( PDFDrive )

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Urogenital

sinus

Mesonephros

Mesonephros

Mesonephric

duct

A

Metanephric

diverticulum

Urorectal

septum

Cloacal

membrane

B

Metanephric

diverticulum

(ureteric bud)

Mesonephric

duct

Allantois

Vesical

part

Pelvic part

Urogenital

sinus

Mesonephros

Mesonephric

duct

Rectum

Phallic part

Ureter

Metanephros

(primordium of

permanent kidney)

C

Genital tubercle

D

Mesonephric

duct

Mesonephros

Gonad

Mesonephros

Metanephros

Metanephros

Urinary bladder

Ureter

Ureter

Rectum

Mesonephric

duct

E

Urorectal

septum

F

Pelvic part

of urogenital

sinus

Urachus

Clitoris

Uterine

tube

Kidney

Ovary

Uterus

Vagina

Urinary

bladder

Penis

Spongy

urethra

Kidney

Testis

Ureter

Ductus

deferens

G

H

FIG. 39.1 Embryology of the Urinary Tract. Diagrams show division of the cloaca into the urogenital sinus and rectum; absorption of the

mesonephric ducts; development of the permanent kidneys (metanephroi), urinary bladder, urethra, and urachus; and changes in the location of

the ureters. (A) Lateral view of the caudal half of a 5-week-old embryo. (B), (D), and (F) Dorsal views. (C), (E), (G), and (H) Lateral views. The

stages shown in (G) and (H) are reached by the 12th week. (With permission from Moore KL, Persaud TVN, editors. The developing human: clinically

oriented embryology. 7th ed. Philadelphia: Saunders; 2003. 3 )

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