Embryology Flashcards Preview

Gross Anatomy > Embryology > Flashcards

Flashcards in Embryology Deck (21):
1

Mitosis

yields 2 diploid cells

2

Meiosis

yields 4 haploid cells
Females- 1 oocyte and 3 polar bodies

3

Zygote

Day 0
diploid
sperm fused with egg

4

Cleavage

Day 1
zygote divides into 2 cells but stays the same size

5

Compaction

Day 3
8 cells fuse together

6

Morula

Day 4
16-32 cells

7

Embryoblast

central blastomeres during compaction
forms embryo placenta

8

Trophoblast

peripheral blastomeres during compaction
forms placenta

9

Blastocoel

cavity w/in morula that stores fluid

10

Blastocyst

Day 5
embryoblast cells compact at one side and trophoblast cells form layer around it
has embryonic pole and abembryonic pole

11

Decidual Cells

react to implantation and progesterone

12

Epiblast

external/ upper layer of bilaminar blastoderm

13

Hypoblast

Internal/ lower layer of bilaminar blastoderm

14

Amniotic Cavity

Day 8
collects fluid between epiblast cells

15

Heuser's Membrane

Day 9
migration of hypoblast cells

16

Primary Yolk Sac

formed by Heuser's Membrane

17

Chorionic Cavity

Days 11-12
extraembryonic mesoderm splits into 2 layers

18

Definitive Yolk Sac

Days 12-13
2nd migration of hypoblast cells
causes primary yolk sac to break up

19

Extraembryonic Mesoderm

outer layer of yolk sac
major site of hematopoiesis

20

Parts of Ectoderm and Mesoderm

Amnion and Chorion

21

Parts of Endoderm and Mesoderm

Yolk Sac