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Diagnostic ultrasound ( PDFDrive )

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Remnant of

pronephros

Mesonephros

B

Mesonephric duct

Metanephric

mass of mesoderm

Ureteric bud

Developing

liver

Cloaca

Metanephric

diverticulum or

ureteric bud

Mesonephric duct

Metanephric mass

of intermedate

mesoderm

Nephrogenic

cord

C

Straight

collecting

tubule

Ureter

D

Pelvis

Major calix

Minor calix

Pelvis

Mesenchymal

cell cluster

Metanephric

mass of mesoderm

A

Primordium of

metanephros

Arched collecting tubule

FIG. 9.1 Embryology of the Kidney and Ureter. (A) Lateral view of a 5-week embryo shows the three embryologic kidneys. (B)-(E) Successive

stages of development of the ureteric bud (ifth to eighth week) into the ureter, pelvis, calices, and collecting tubules. (With permission from The

urogenital system. In: Moore KL, Persaud TVN, editors. The developing human: clinically oriented embryology. 5th ed. Philadelphia: Saunders; 1993.

pp. 265-303. 2 )

E

Lobe

Groove between

lobes

Allantois

Primitive urigenital sinus

A

Cloacal membrane

C

Genital tubercle

Urogenital

membrane

Mesonephros

Ureteric bud

Urorectal septum

Hindgut

Vesical

part

Pelvic

part

Phallic

part

Urogenital sinus

Mesonephros

Metanephros

Urinary bladder

B

D

Mesonephros

Mesonephric duct

Mesonephros

Metanephros

Gonad

Mesonephros

Metanephros

Ureter

Mesonephric duct

FIG. 9.2 Embryology of the Bladder and Urethra. Diagrams

show division of the cloaca into the urogenital sinus

and rectum; absorption of the mesonephric ducts; development

of the urinary bladder, urethra, and urachus; and change

in location of the ureters. (A) and (B) Five-week embryo.

(C)-(H) Seven- to 12-week embryo. (A, C, E, and G, female;

B, D, F, and H, male.) (With permission from The urogenital

system. In: Moore KL, Persaud TVN, editors. The developing

human: clinically oriented embryology. 5th ed. Philadelphia:

Saunders; 1993. pp. 265-303. 2 )

E

Urachus

Clitoris

G

Rectum

Ureter

F

Uterine tube Urinary bladder

Kidney

Ovary

Uterus

Vagina

Penis

Spongy urethra

H

Pelvic portion of

urogenital sinus

Kidney

Testis

Ureter

Ductus

deferens

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