Random Embryo

Question 1

Neural crest gives rise to

Answer 1

DRG and ANS ganglia, pigment cells…

Question 2

secretes HCG

Answer 2

syncytiotrophoblast

Question 3

After gastrulation, where is the disc not trilaminar?

Answer 3

cloacal and oropharyngeal membranes

Question 4

Origin of ligamentum arteriosum

Answer 4

Ductus arteriosum (from distal left 6th pharyngeal arch)

Question 5

Origin of common carotid aa.

Answer 5

3rd pharyngeal arches

Question 6

Origin of sinus venarum

Answer 6

Right horn of sinus venosus (sinus venarium-smooth part of right atrium)

Question 7

coronary sinus (embryological origin)

Answer 7

left horn of sinus venarium

Question 8

aorticopulmonary septum (embryological origin)

Answer 8

Truncal and bulbar ridges

Question 9

pulmonary aa. (embryological origin)

Answer 9

6th pharyngeal arches

Question 10

origin of sacrococcygeal teratoma

Answer 10

primitive streak

Question 11

What 2 things does the connecting stalk connect?

Answer 11

• extraembryonic somatic mesoderm

- extraembryonic splanchnic mesoderm

Question 12

finger-like extensions of cytotrophoblast into the syncytiotrophoblasts.

Answer 12

primary chorionic villi (contains trophoblast only)

Question 13

secondary chorionic villi vs. tertiary

Answer 13

secondary: trophoblast + mesoderm
tertiary: trophoblast + mesoderm + umbilical vessels