Embryology

Question 1

conceptus occurs between

Answer 1

0-3 weeks

Question 2

when is the term embryo used

Answer 2

4-8 weeks

Question 3

when is the term foetus used

Answer 3

week 9 - birth

Question 4

what are the 6 phases of embryonic development

good fathers can get mothers off….

Answer 4

• gametogenesis
• fertilisation
• cleavage
• gastrulation
• morphogenesis/formation
• organogenesis

Question 5

what happens during gametogenesis

Answer 5

• germ cell formation

Question 6

what happens during fertilisation

Answer 6

fusion of sperm and oocyte to form ZYGOTE

Question 7

what happens during cleavage

Answer 7

rapid cell division

Question 8

what happens during gastrulation

Answer 8

formation of germ layers

- Ecto (outer), Meso (middle), Endo (inner) derm

Question 9

what happens during formation

Answer 9

embryonic folding

Question 10

what happens during organogenesis

Answer 10

formation of organs

Question 11

what will the ectoderm go on to produce

Answer 11

skin and nervous system

Question 12

what will the mesoderm go on to produce

Answer 12

organs

Question 13

what will the endoderm go on to produce

Answer 13

• lining of gut

- lung bud

Question 14

What is the zona pellucida?

Answer 14

Tough protein coat surrounding oocyte to give it protection

Question 15

what daughter cells are formed during cleavage

Answer 15

blastomeres

Question 16

after __ cells compaction takes place the zygote becomes a ___

Answer 16

• 8 (totipotent)

- blastocyst

Question 17

during gastrulation cells migrate through what

Answer 17

primitive streak

Question 18

when is the embryo at most risk of defects

Answer 18

3-8 weeks

Question 19

what week does the heart beat development

Answer 19

week 4

Question 20

incomplete closure of embryonic foramen ovale in septum leads to ____

Answer 20

atrial septal defect