UG Development

Question 1

urorectal septum separates ___ into __ and ___

Answer 1

cloacal membrane: urogenital membrane and anal membrane

Question 2

UG sinus forms

Answer 2

urethra and bladder (endoderm)

Question 3

allantois

Answer 3

ventral extension of the cloaca, forms medial umbilical ligament and urachus

Question 4

pronephric tissue

Answer 4

transient, gone after 4w, predecessor of the wolffian duct

Question 5

mesonephric tissue

Answer 5

form small mesonephric extretory tubules that collect in mesonephric duct (vas deferns)

Question 6

metanephric tissue

Answer 6

ureteric bud outgrowth becomes ureter and renal pelvis/calyces.

metanephric blastema forms Bowman’s capsules and tubules of kidney

Question 7

Trigone

Answer 7

where ureter and mesonephric ducts are incorporated to cloaca and bladder (contains endoderm and mesoderm)

Question 8

formation of germ cells

Answer 8

4weeks: yolk sac formation
5weeks: genital ridge (mesonephros)
6weeks: coelomic epithelian cells form primitive sex cords

ovary - mesonephric tubules and duct degenerate

testes - primitive sex cords connect with mesonephric tubules, forming medullary coords and rete testes that can carry sperm from semineiferous tubules. tunica albuginea is a white covering

Question 9

genital ducts - female

Answer 9

paramesonephric - uterine tubes, uterus, cervix, superior vagina

Question 10

genital ducts - male

Answer 10

epididymis, sinovaginal bulbs, ductus deferens

Question 11

external genitalia is comprised of:

Answer 11

genital tubercle: clitoris OR penis

genital folds: labia minora OR walls of the urethral groove

genital swellings: labia majora OR scrotum (remains separated)