Quiz 1

Question 1

What are the three stages of human development and when do they occur

Answer 1

1. Pre-implantation/preembryonic (1 week)
2. Embryonic (week 2-week8)
3. Fetal (week 3-38)

Question 2

Which stage of human development has the greatest sensitivity to teratogens

Answer 2

week2-8

Question 3

describe the morula

Answer 3

16 blastomeres contained within the zona pellucida

Question 4

When does morula become blastocyst?

Answer 4

When it enters the uterine cavity and zona pellucida breaks down

Question 5

What day does the morula form?

Answer 5

day 4

Question 6

draw/label a blastocyst

Answer 6

Question 7

Where does fertilization take place?

Answer 7

Question 8

When does blastocyst form?

Answer 8

~5

Question 9

When does implantation begin

Answer 9

End of week 1

Question 10

trophoblast goes on to form

Answer 10

placenta

Question 11

What two layers make up the bilaminar germ disk

Answer 11

1. epiblast
2. hypoblast

Question 12

When does formation of bilaminar germ disk happen

Answer 12

day 6

Question 13

hypoblast sends out cells to form the ___ ___ which then forms the ___ ___ which provides nutrition

Answer 13

exocoelomic membrane

yolk sac

Question 14

trophoblast differentiates into

Answer 14

The syncytiotrophoblasat and cytotrophoblast

Question 15

Exocoelomic membrane produces a layer of losse connective tissue called the ___ ___

Answer 15

extraembryonic mesoderm

Question 16

Lacunae form within the extraembryonic mesoderm which coalesce to form the __ ___

Answer 16

extraembryonic coelom

Question 17

What is the extension of the extraembryonic mesoderm that connects the embryo to the cytotrophoblast

Answer 17

connecting stalk which becomes umb. cord

Question 18

At what day does the syncytiotrophoblast come into contact with maternal sinusoids (blood supply) and the extraembryonic mesoderm forms?

Answer 18

12

Question 19

Extraembryonic coelom is formed from

Answer 19

extraembryonic coelom

Question 20

What day is embryo differnetiated into epiblast and hypoblast?

Answer 20

13

Question 21

whom forms cells for whom syncytiobrophobast or cytotrophoblast

Answer 21

cytotrophoblast makes cells for syncytiotrophoblast.

Question 22

Gastrulation begins iwth the formation of the

Answer 22

primitive streak

Question 23

primitive streak forms on which end of embryo? cranial or caudal

Answer 23

caudal

Question 24

Cells that form notocord enter mesoderm from where? and move in what direction

Answer 24

primitive pit

cranially along midline

Question 25

T/F notochord serves as basis for development of axial skeleton

Answer 25

true

Question 26

What are the names of and what happens at two places between epiblast /hypoblast where mesoderm does not enter

Answer 26

oropharyngeal membrane (becomes mouth) cloacal membrane (becomes anus)

Question 27

What day does primitive streak form?

Answer 27

day 15

Question 28

When does epiblast start moving in to form mesoderm

Answer 28

16

Question 29

Gastrulation/ Devlopment progresses in which direction

Answer 29

cranial to caudal

Question 30

Gastrulation continues until the end of

Answer 30

Week 4

Question 31

ectoderm gives rise to what 2 things

Answer 31

outer skin and nervous system

Question 32

mesoderm forms what three tissues

Answer 32

muscle, connective, skeletal

Question 33

endoderm forms

Answer 33

innerlining of gastrointestinal and respiratory systems

Question 34

look at formation of extrembryonic coelom

Question 35

Neuralation begins when ___ induces a portion of the surface ectoderm to form the \_\_\_ \_\_\_\_

Answer 35

notochord neural plate

Question 36

Neural crest cells migrate and form mant structures in the embryo like portions of the\_\_\_\_, bones of the \_\_\_, and ____ of the PNS

Answer 36

heart face ganglia

Question 37

Fusion of the neural tube begins in the ____ region and proceeds ____ and \_\_\_\_\_

Answer 37

cervical cranially caudally

Question 38

Which neuropore closes first?

Answer 38

anterior

Question 39

neuralation is complete by end of which week?

Answer 39

4

Question 40

arachnoid and pia mater are formed from what tissue?

Answer 40

neural crest cells

Question 41

Inductionof limb buds comes from which layer?

Answer 41

surface ectoderm

Question 42

glands come from which germ layer

Answer 42

surface ectoderm

Question 43

connective tissue develops from what?

Answer 43

neural crest cells

Question 44

The most medial layer of mesoderm is called

Answer 44

paraxial mesoderm

Question 45

What are the three layers of mesoderm?

Answer 45

paraxial, intermediate, and lateral

Question 46

Which section of mesoderm forms somites?

Answer 46

paraxial

Question 47

skeletal muscle of back, trunk, and limbs comes from where?

Answer 47

paraxial mesoderm

Question 48

vertebrae come from where

Answer 48

paraxial mesoderm

Question 49

intermediate mesoderm forms what?

Answer 49

urogntial system

Question 50

bones come from where

Answer 50

lateral plate mesoderm

Question 51

most of cardiovascular system comes from where

Answer 51

lateral plate mesoderm

Question 52

smooth muscle comes from where?

Answer 52

lateral plate mesoderm--visceral layer

Question 53

serous lining of body caviites come from where?

Answer 53

lateral plate mesoderm

Question 54

dermis/hypodermis comes from where?

Answer 54

paraxial mesoderm

Question 55

serous membranes that line intraembrynonic body cavity come from where?

Answer 55

parietal layer of lateral plate mesoderm

Question 56

parietal layer of lateral plate mesoderm is in contact with what/which germ layer?

Answer 56

surface ectoderm

Question 57

visceral layer of lateral plate mesoderm is in contact with what/which germ layer?

Answer 57

endodoerm

Question 58

parenchyma of liver and pancrease come from where?

Answer 58

endoderm

Question 59

lateral folding is induced by growth of waht

Answer 59

amniotic cavity

Question 60

longitudinal folding is caused by

Answer 60

rapid growth and development of the brain

Question 61

urinary bladder comes from

Answer 61

endoderm

Question 62

What two regions of spinal cord have enlargements and why?

Answer 62

cervical and lumbar because they innervate extremities

Question 63

function of filum terminale

Answer 63

anchor the spinal cord and dural sac to coccyx