Embryology Flashcards Preview

Pediatrics > Embryology > Flashcards

Flashcards in Embryology Deck (22):
1

Average Fetal age from conception to birth

38 weeks

2

Average Gestational age from conception to birth

40 weeks

3

During what period are all major organs formed?

embryonic (first 8 weeks)

4

During what period do all organs grow larger and become more complex?

fetal (last 30 weeks)

5

egg released into the peritoneal cavity

ovulation

6

occurs as egg travels down fallopian tube and meets sperm

fertilization

7

the cell that forms when the ova and sperm fuse

zygote

8

begins immediately as the zygote travels down the fallopian tube & into the uterus

cell division

9

the solid cluster of 12-16 blastomeres at about 72 hours

morula

9

On day 4 post conception, what does the 60 cell morula become when it enters the uterus and takes up fluid?

blastocyst

9

type of cell in blastocyst stage that forms the embryo

inner cell mass

10

layer of cells surrounding the cavity which helps form the placenta

trophoblast

11

What happens if inner cell mass of a single blastocyst divides?

monozygotic (identical) twins

12

two fluid filled sacs in the inner cell mass

Amniotic sac from epiblast
Yolk sac from hypoblast

13

will become the serous cavities of the ventral body cavity

coelem

14

period when MOST gross structural birth defects are induced

Weeks 3-8 (Organogenesis)

15

When does the heart start pumping in the embryo?

29 days (one month)

16

When does closure of the neural tube occur?

week 3-week 4

17

lateral ectodermal cells, pulled along and form sensory nerve cells and other structures

neural crest

18

Germ layer that becomes epidermis, hair, nails, glands of skin, brain, spinal cord, neural crest

ectoderm

19

Germ layer that becomes intervertebral discs, trunk and limb musculature, vertebrae, ribs, kidneys, gonads, connective tissue, heart, blood vessels

mesoderm

20

Germ layer that becomes epithelial lining and glands of digestive and respiratory tracts

endoderm