Anatomy - Embryology Weeks 1-3

Front 1

series of mitotic cell divisions in the zygote, occurs around 30 hours

Back 1

cleavage

Front 2

a single cell after fertilization with one spermatozoon and oocyte

Back 2

zygote

Front 3

collectively, the follicular cells and the oocyte

Back 3

follicle

Front 4

when an oocyte is released from the ovary

Back 4

ovulation

Front 5

where fertilization normally occurs

Back 5

ampulla or dialated portion of the fallopian tube

Front 6

where cleavage occurs

Back 6

the lumen of the fallopian tube

Front 7

when the conceptus enters the uterine cavity

Back 7

4 days

Front 8

name of the cells after the zygote stage (more than one cell present)

Back 8

blastomeres

Front 9

the name of the 12-32 cell stage

Back 9

morula

Front 10

an acellular membrane that surrounds and protects the blastomeres.

Back 10

zona pellucida

Front 11

disintegration of the zona pellucida

Back 11

"hatching" of the blastocyst

Front 12

name of the stage in which fluid passes between the blastomeres

Back 12

blastocyst

Front 13

the inner cell mass of the blastocyst will give rise to what

Back 13

embryoblast-->embryo

Front 14

the outer cell layer of the blastocyst will give rise to what

Back 14

trophoblast-->embryonic part of the placenta

Front 15

innermost layer of the uterus

Back 15

endometrium

Front 16

middle layer of the uterus

Back 16

myometrium

Front 17

outer layer of the uterus

Back 17

perimetrium

Front 18

the blastocyst attaches itself to the endometrial lining via the

Back 18

embryonic pole

Front 19

7 days after fertilization, you see this layer that forms between the inner cell mass and the blastocystic cavity

Back 19

hypoblast (primary endoderm)

Front 20

7 days after fertilization, the new name for the trophoblast

Back 20

cytotrophoblast

Front 21

the part of the cytotrophoblast that has finger-like projections that extend into the endometrial lining. mass of nuclei and cytoplasm

Back 21

syncytiotrophoblast

Front 22

ideal location for implantation of the blastocyst

Back 22

posterior wall of the uterus

Front 23

name of the embryo during week 2

Back 23

bilaminar germ disc/bilaminar embryonic disc

Front 24

the two embryonic layers during week 2

Back 24

-epiblast
-hypoblast

Front 25

name of the blastocystic cavity during week 2

Back 25

exocoelomic cavity

Front 26

flat cells that line the exocoelomic cavity

Back 26

exocoelomic membrane

Front 27

layer of the bilaminar germ disc that is closest to the exocoelomic cavity

Back 27

hypoblast

Front 28

layer of the bilaminar germ dis that is farther from the exocoelomic cavity

Back 28

epiblast

Front 29

a new layer that is formed between the epiblast and the syncytiotrophoblast

Back 29

amniotic cavity

Front 31

the name of the exocoelomic cavity during the 2nd half of week

Back 31

primary umbilical vesicle

Front 32

formation of this layer happens at around day 9 between the amniotic cavity/primary umbilical vesicle and the cytotrophoblast

Back 32

extraembryonic mesoderm

Front 33

small bubbles form in the extraembryonic mesoderm around day 9/10 and form a space called _____ that separates the extraembryonic mesoderm in 2 layers

Back 33

extraembryonic coelom

Front 34

day that the entire blastocyst has implanted itself into the endometrial lining

Back 34

day 10

Front 36

layer that secretes hCG

Back 36

syncytiotrophoblast

Front 37

primary umbilical vesicle begins to pinch off and becomes

Back 37

secondary umbilical vesicle

Front 38

layer of the extraembryonic mesoderm that covers the amnion and lines the trophoblast

Back 38

somatic layer

Front 39

the layer of the extraembryonic mesoderm that covers the umbilical vesicle

Back 39

splanchnic layer

Front 40

innermost layer of the chorion

Back 40

somatic extraembryonic mesoderm

Front 41

the intermediate layer of the chorion

Back 41

cytotrophoblast

Front 42

the outer layer of the chorion

Back 42

syncytiotrophoblast

Front 43

suspends the bilaminar embryonic disc; formed using the extraembryonic mesoderm

Back 43

connecting stalk

Front 44

the floor of the amniotic cavity is formed by:

Back 44

epiblast

Front 45

the roof of the umbilical vesicle is formed by:

Back 45

hypoblast

Front 46

3 embryonic layers during week 3

Back 46

epiblast
mesoblast (new)
hypoblast

Front 47

3 cavities during week 3

Back 47

amniotic cavity
secondary umbilical vesicle
extraembryonic coelom --> becomes the chorionic cavity

Front 48

3 new structures during week 3

Back 48

primitive streak
notochord
neural tube

Front 49

the membrane that forms head, cranial end

Back 49

prechordal plate

Front 50

forms in the midline in the caudal end of the developing embryo on the dorsal surface (during week 3)

Back 50

primitive streak

Front 51

the cranially oriented, rounded portion of the primitive streak

Back 51

primitive node

Front 52

cells from primitive streak dive deep between epiblast and hypoblast to form:

Back 52

mesoblast

Front 53

cells dive deep in the primitive node to form a dimple known as the:

Back 53

primitive pit

Front 54

formation of the third germ layer is known as

Back 54

gastrulation

Front 55

epiblast becomes what germ layer

Back 55

ectoderm

Front 56

mesoblast becomes what germ layer

Back 56

mesoderm

Front 57

hypoblast becomes what germ layer

Back 57

endoderm

Front 58

mesoblast (mesenchyme) will give rise to what

Back 58

intraembryonic mesoderm

Front 59

intra embryonic mesoderm will give rise to what adult structures

Back 59

connective tissue
skeleton
skeletal and smooth muscle
bone marrow
blood cells
CV system
GU system

Front 60

epiblast gives rise to 2 tissues which are:

Back 60

intraembryonic endoderm
intraembryonic ectoderm

Front 61

intra embryonic endoderm gives rise to which adult structures

Back 61

epithelium lining respiratory tract
epithelium lining GI tract
GI glands

Front 62

intra embryonic ectoderm gives rise to what adult structures

Back 62

epidermis of skin
nervous system
retina

Front 63

primitive node cells dive deep between endoderm and ectoderm to form a rod that extends cranially towards the prechordal plate known as:

Back 63

notochordal process

Front 64

membrane that will form border between primitive mouth and pharynx
(cranial formation)

Back 64

oropharyngeal

Front 65

bone of the vertebral column is derived from what

Back 65

somites

Front 66

urinary system is derived from:

Back 66

intermediate mesoderm

Front 67

neuroectoderm is derived from

Back 67

ectoderm (derived from epiblast)

Front 68

neuroectoderm will give rise to:

Back 68

neural tube
neural crest

Front 69

neural tube gives rise to

Back 69

CNS
retina
pineal
neurohypophysis

Front 70

neural crest gives rise to

Back 70

PNS
suprarenal medulla
melanocytes

Front 71

thickening of ectoderm

Back 71

neural plate

Front 72

neural folds elevate to form what

Back 72

neural tube

Front 73

rostral neuropore will give rise to _____ and close at _____.

Back 73

brain
24 days

Front 74

caudal neuropore will close at

Back 74

27 days

Front 75

primitive cavity gives rise to what

Back 75

pericardial cavity
pleural cavity
peritoneal cavity