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Flashcards in Embryology Deck (20):
0

Endoderm forms what in the urinary system?

Most of bladder
Urethra

1

Intermediate mesoderm

kidneys
Ureter
Bladder

2

Three pairs of kidneys

Pronsphros
Mesonephros
Metanephros

3

Pronephros

In the cervical region and does very little, contains: nephrotomes

4

Mesonephros

Forms and thoracic and lumbar regions

Forms Bowmans capsule and the filtrate of the glomeruli

Drains into the mesonephric duct

5

Mesonephric (wolffian) duct

Extends caudaly and empties into the Cloaca (future urogenital sinus)

Creates outgrowths for the ureters

Forms the vas deferens in males and degenerates in females

6

Metanephros

Forms the metanephric blastema and urethric bud which form the kidneys

7

Ureteric bud

Renal pelvis
Major calices
Minor calices
Collecting ducts

8

Metanephric blastoma

Forms nephrons

9

The cloaca divides into...

Urogenital sinus
Anorectal canal

10

Parts of the urogenital sinus

-bladder and vesicle

-pelvic part
(in males the prosthetic and membranous urethra)

-phallic part
(penis in males and vestibule of vagina in females)

11

Bladder defects

Urachal fistula
Urachal sinus
Urachal cysts

12

Genital ridges form from:

Intermediate mesoderm
Splanchnic lateral plate mesoderm

13

Testis development

The primitive sex cords become the seminiferous tubules and join with the mesonephric duct which becomes the vas deferens and the epididymis

14

The prostate and Bulbourethral glands form from what layer?

Endoderm of the urogenital sinus

15

Ovary development

The primitive sex cords degrade and are followed by secondary sex cords or cortical cords these cords form oogonia. The mesonephric duct degrades and the paramesonephric duct develops.

16

Paramesonephric duct

Forms uterine tubes and uterovaginal canal

17

Two layers of the trophoblast

Cytotrophoblast
Syncytrophoblast

18

Definitive yolk sac

Part of the primary yolk sack that degenerates

19

Allantosis

The core of the connecting stock