Embryonic Development Flashcards
During 7 days after fertilization, single-celled zygote turns into
Gastrula
Ovum fertilization by sperm produces
Zygote
Zygote = \_\_\_\_ cell Two-cell stage = \_\_\_\_\_ cells Four-cell stage = \_\_\_\_\_ cells Morula Blastula Gastrula
1, 2, 4
Implantation begins on day:
8
Around time of implantation, at the point of development called ________, cells are dividing more rapidly on one side of embryo than the other
Gastrulation
*layers that will eventually form 3 distinct regions of the body are visible under microscope
Three germ layers:
Ectoderm
Mesoderm
Endoderm
Ectoderm will form…
Integumentary Some skeletal Nervous Some endocrine Respiratory Digestive
Mesoderm will become…
Skeletal Muscular Endocrine Cardiovascular Lymphatic Urinary Reproductive
Endoderm will become…
Some endocrine Respiratory Digestive Some urinary Some reproductive
Temporary nourishment for embryo is from what?
Yolk sac
What contains fluid that protects embryo?
Amnion - amniotic fluid
What encapsulates the amnion and invades the endometrium for the formation of the placenta?
Chorion
1
Ovary
2
Primary oocyte
3
Oocyte with corona radiata
4
Developing fluid filled vesicular follicles
5
Ovulating follicle
6
Corpus luteum
7
Corpus albicans
8
Mature ovum discharged from follicle
9
Fimbriated end of oviduct
10
Ovum in oviduct with sperm ready to penetrate (fertilization first day -B)
11
Oviduct
12
Cleavage of fertile ovum (C)
13
Morula (third day -D)
14
Embryonic vesicle enters uterus (4th or 5th day)
15
Implantation of vesicle begins in endometrial epithelium (7th day)
16
Corpus of uterus
17
Fundus of uterus
18
Myometrium
19
Cervix of uterus
20
Endometrium
21
Vagina
22
Nucleus of ovum
23
Zona pellucida of ovum
24
Corona radiata of ovum
25
Sperm cell
26
Yolk sac
27
Embryonic disk
28
Amnion
29
Embryonic placenta (trophoblast tissue)
30
Body of embryo
31
Amnion/amniotic cavity
32
Developing heart
33
Yolk sac
34
Yolk sac stalk
35
Allantoic diverticulum
Allantois, origins of tissues of urinary bladder
36
Body stalk
37
Extra embryonic coelom (cavity)
38
Chorion
39
Placental villi
40
Belly stalk (developing umbilical cord)
41
Forebrain area
42
Midbrain area
43
Hindbrain area
44
Eye
45
Developing outer ear
46
Heart prominence
47
Liver prominence
48
Differentiating somites
49
Tail
50
Notches between digital rays of hand
51
Toe rays
52
Embryo with membranes in situ