Embryology

Question 1

At which gestation does the endoderm, mesoderm and ectoderm form?

Answer 1

3 weeks

Question 2

What are the 3 main groups of the mesoderm?

Answer 2

Paraxial
Intermediate
Lateral plate

Question 3

Which 2 systems in the body are functionally distinct but developmentally and anatomically similar?

Answer 3

Renal system

Genital system

Question 4

Renal and genital system both arise from which group of mesoderm?

Answer 4

Intermediate

Question 5

What is the function of primordial germ cells?

Answer 5

Migrate from yolk sac to the intermediate mesoderm and start to infiltrate the proliferating body epithelium..
We then get the formation of genital ridges which forms primitive sex cords.

Question 6

Name the 2 genital ducts

Answer 6

Mesonephric (Wollfian) duct

Paramesonephric (Mullerian) duct

Question 7

At what gestation does sex differentiation occur?

Answer 7

From 7 weeks onwards

Question 8

Where do testes originate?

Answer 8

Posteriori abdominal wall, around 10th thoracic vertebrae level.

Question 9

What pulls the testes down to their final position?

Answer 9

Gubernaculum

Question 10

Layers of the testes

Answer 10

Peritoneum
Trasversali fascia 
Transversus abdominus muscle - only initially 
Internal abdominal oblique
External abdominal oblique

Question 11

At which week of gestation do the male accessory glands form?

Answer 11

week 10

Question 12

What are the 3 male accessory glands that form?

Answer 12

Prostate gland
Bulbourethral gland
Seminal vesicle

Question 13

What does the prostate gland develop from?

Answer 13

Endoderm

Question 14

What does the bulbourethral gland develop from?

Answer 14

Endoderm

Question 15

What does the seminal vesicle develop from?

Answer 15

Mesonephric duct

Question 16

In the female external genitalia, what does the genital tubercle become?

Answer 16

Clitoris