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Flashcards in Development of the Urinary System Deck (22)
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1

Functionally the urogenital system can be divided into two entirely different components which are what?

The urinary system and the genital system

2

The urogenital system's two parts develop from what?

A common mesodermal ridge (intermediate mesoderm)

3

What is the urogenital ridge?

This is intermediate mesoderm that bulges into the intraemrbyonic coelmic cavity

4

The urogenital ridge differentiates into what two things?

The nephrogenic cord/ridge and the genital ridge

5

Through lateral folding where does the nephrogenic cord end up?

Retroperitoneal

6

What are the three developmental kidney systems?

Pronephros, mesonephros, and metanephros

7

When does the pronephros appear?

Early in week 4

8

Is the pronephros ever functional?

No

9

Where does the mesonephros appear?

In thoracic and lumbar segments of intermediate mesoderm

10

In the mesonephros urine is produced and drains along what?

Mesonephric (wolffian) duct to cloaca/bladder

11

What does the mesonephros initiate?

The ureteric bud/metanephric diverticulum growth

12

What structure marks the beginning of the metenephros?

When the ureteric bud (metenephric diverticulum) sprouts from the distal end of the mesonephric duct

13

What is the metanephric blastema?

A structure that forms the glomeruli and tubules of the nephrons

14

What are the two components of the metanephros?

Collecting portion (ureteric bud) and excretory portion (metanephric blastema)

15

If what is missing or abnormal a kidney will not form?

A bud

16

What is reciprocal induction?

Close proximity to ureteric bud will induce nephron differentiation

17

What are the collecting portion structures of the metanephros?

Ureter, renal pelvis, and major and minor calyces

18

What are the excretory portion structures of the metanephros?

Bowman's capsule, proximal convoluted tubule, loop of henle, distal convoluted tubule

19

Cloaca in the hindgut becomes divided by what? (ventral and dorsal)

Urorectal septum, ventral urogenital sinus and dorsal anorectal canal

20

What is the trigone of the bladder?

The distal portions of the mesonephric ducts and the attached ureteric ducts, become incorporated into the posterior aspects of the bladder

21

In females the development of urethra comes from what?

The whole urethra and part of the vagina arise from the pelvic part of the urogenital sinus

22

In males the urethra comes from what?

Prostatic and membranous parts of the urethra arise from the pelvic part of the urogenital sinus while the spongy urethra comes from the phallic part.