Topic #12 DEVELOPMENT OF THE URINARY SYSTEM

Question 1

The urinary system is located

Answer 1

outside of the peritoneal cavity in the dorsolateral body wall.

Question 2

The adult urinary system consists of the

Answer 2

kidneys (2), ureters (2), renal pelvis (2), urinary bladder and urethra.

Question 3

The urinary system is derived from

Answer 3

intermediate and somatic mesoderm.

Question 4

It consists of 7-8 pairs of primitive pronephric tubules that appear in sequence, starting at the
level of somite 5 to 16.

Answer 4

Pronephros

Question 5

It is the excretory organ of some lowest fishes.

Answer 5

Pronephros

Question 6

Consist of 70 -80 mesonephric tubules induced to form in sequence caudal to the pronephric tubules by the mesonephric tubules develops from a solid bud of mesodermal cells that hollows
out.

Answer 6

Mesonephros

Question 7

may result from ureteric atresia or from failure of nephrons to communicate with collecting tubules.

Answer 7

Hydronephrosis

Question 8

results from a failure of the allantoic stalk to close at birth. Also, vesicourachal diverticulum (urachus persisting as a blind pouch) is a sourced of chronic cystitis and chronic dribbling of urine at the umbilicus.

Answer 8

Patent urachus

Question 9

entry of the ureter into the urethra or vagina instead of the urinary bladder that results in urinary bladder infection or incontinence (urine dribbling) because urine is deposited
beyond the urinary sphincters.

Answer 9

Ectopic ureter

Question 10

Due to faulty separation of the
cloaca into rectum and urogenital sinus, a fistulous tract may remain that leads to abnormal
elimination of urine and feces and urinary tract infection.

Answer 10

Urorectal fistula: rectovesicular; rectovestibular; rectourethral