Embryology

Question 1

pharyngeal arches staert to develop in ____ week

Answer 1

4th week

Question 2

first pharyngeal arch derivatives:

Answer 2

mandible and maxillary
malleus and incus
IM

Question 3

Second pharyngeal arch derivatives:

Answer 3

stapes, styloid, lesser hyoid bone
LS

Question 4

3rd pharyngeal arch derivatives:

Answer 4

greater hyoid bone and thyroid cartilage

Question 5

4th and 6th pharyngeal arches derivatives:

Answer 5

laryngeal cartilages

Question 6

pharyngeal arches nerves:

Answer 6

1 > 5
2 > 7
3 > 9
4,6 > 10

Question 7

auricular hillocks is developed from ______
and ascends from _____

Answer 7

1st and 2nd arches
mandible.

Question 8

tubotympanic recess. is from the ____ and it forms the ____

Answer 8

1st arch and it develops the tympanic cavity and the auditory tube

Question 9

otic placodes are developed in ___ week and the develop into otic vesicle which differentiate into:

Answer 9

4th
dorsal (utricle and semicircular)
ventral (saccule and cochlea)

Question 10

optic vesicle is. developed in the ___ week

Answer 10

4th

Question 11

lens placodes developes the___

Answer 11

lens (ectoderm)

Question 12

optic cups creates:
and its supplied by

Answer 12

inner layer : nural retina
outer layer : pigment layer
hyaloid vessel supplies it

Question 13

is developed from the mesenchyme surrounding the optic cups

Answer 13

choroid and sclera

Question 14

iris is formed by the

Answer 14

optic canal

Question 15

cornea is formed by the

Answer 15

ectoderm and mesenchyme