Key Terms Matching
A. sperm penetrates oocyte
B. inner sac around embryo
C. period of rapid cell division
D. germ layer destined to form most bones
E. blastocyst burrows into endometrium
F time of organ system maturation
G. blastodisc layer facing the amniotic cavity
H. appears only if secondary oocyte is fertilized
I. maternal part of placenta
J. hollow cavity inside blastocyst
K. site of early blood formation
L. completion of the fetal stage
M. carries oxygenated blood to fetus
N. a solid ball of cells
O. embryonic part of the placenta
P the embryonic stage
Q process of two layers becoming three germ layers
R. outer layer of cells around blastocyst
S. created by fusion of ovum and sperm
T. cells of blastocyst destined to be embryo
U. germ layer destined to form respiratory epithelium
V. the individual dividing cells during cleavage
W. germ layer destined to form all nervous tissue
1. 1st trimester X. blastodisc layer facing the blastocoel
2. ectoderm Y. create gaps through corona radiata ectoderm
3, trophoblast -
4. hypoblast
5. ovum
6. amnion
-7. morula
9. mesoderm
10, 2nd trimester
11. decidua basalis
12. cleavage
13, yolk sac
14. fertilization
15. blastocoel
16. epiblast
17. acrosomal enzymes
18. chorion 一一
19, 3rd trimester nuclei
20. endoderm
21. inner cell mass
22. blastomeres
23 umbilical vein
24, zygote
-25. gastrulation