Embryology

Question 1

What occurs in gastrulation?

Answer 1

Formation of the trilaminar disc

Question 2

The urogenital system is formed from which primary germ cell layer?

Answer 2

Mesoderm

Question 3

Genital ridges are formed by the thickening of what?

Answer 3

Coelomic epithelium

Question 4

Which ducts are formed in the ambisexual phase?

Answer 4

Wollfian and Mullerian ducts

Question 5

When does sexual differentiation occur in embryonic development?

Answer 5

Week 7

Question 6

Male development is triggered by what?

Answer 6

Sex determining region of Y transcription factor

Question 7

The presence of SRY protein stimulates the formation of what?

Answer 7

Sertoli cells

Question 8

Give two main effects of the Sertoli cells

Answer 8

Degeneration of Mullerian duct

Leydig cell formation

Question 9

Which hormone is secreted by Leydig cells?

Answer 9

Testosterone

Question 10

Which three male accessory glands spout during week 10?

Answer 10

Prostate
Bulbourethral gland
Seminal vesicle

Question 11

When does female genital development occur?

Answer 11

In the absence of SRY transcription factor

Question 12

What structures do the Müllerian ducts give rise to?

Answer 12

Uterine tubes
Uterus
Superior vagina

Question 13

What are the three parts of the Mullerian duct?

Answer 13

Cranial portion
Horizontal portion
Caudal portion

Question 14

Which part of the Mullerian duct gives rise to the uterus and superior vagina?

Answer 14

Caudal portion

Question 15

What occurs in hypospadias?

Answer 15

The external urethral opening lies along the ventral aspect of the penis