L1 : general embroyology

Question 1

how many cells are in the morula stage of cell division ?

Answer 1

32

Question 2

when does the formation of the 3 germ layers occur?

Answer 2

from first day of IUL till 3rd week

Question 3

what happens in the embryonic stage ?

Answer 3

3rd week - 8th week IUL , all organs are formed

Question 4

what could happen if an error occurs during the formation of germ layers?

Answer 4

abortion

Question 5

when are congenital abnormalities most common?

Answer 5

embryonic stage

Question 6

when’s the best time to treat a pregnant woman?

Answer 6

during the second trimester

Question 7

what stage do organs grow and mature in?

Answer 7

foetal stage

Question 8

how does the neural plate form ?

Answer 8

thickening of ectoderm

Question 9

ectodermal cells are___
endodermal cells are___

Answer 9

columnar
cuboidal

Question 10

what does the neural tube give rise too?

Answer 10

brain and spinal cord

Question 11

neural crest cells are ____ in nature

Answer 11

ectodermal

Question 12

connective tissue in the head and neck region is ___

Answer 12

echtomesenchymal

Question 13

what’s the only dental structure that’s ectodermal in nature ?

Answer 13

enamel

Question 14

all other dental structures originate from _____

Answer 14

ecto-mesodermal

Question 15

longitudinal folding of embryo results in :

Answer 15

formation of stomodeum

Question 16

lateral folding of embryo results in :

Answer 16

formation of foregut

Question 17

what structure does the foregut give rise to??

Answer 17

it forms the primative pharynx and the midgut and hindgut form the rest of the pharynx and digestive tract.

Question 18

neural plate is covered by?

Answer 18

ectoderm columnar cells and endoderm cuboidal cells