| A | B |
|---|
| gamete | sperm or ovum - mature germ cell |
| ovulation | ovary releasing ovum |
| conception or fertilization | sperm entering ovum in fallopian tube |
| zygote | union of sperm and ovum - lasts about 7 days |
| embryo | from 7 days to 2 months development |
| fetus | third month to end of pregnancy |
| gestation or pregnancy | development from conception to birth |
| gestation period | length or duration of pregnancy |
| implantation or nidation | implanging of zygote in utering lining about 7 days after fertilization |
| amniotic or amnionic sac | membranes surrounding fetus |
| chorion | outer layer of fetal membrane |
| amnion | inner layer of fetal membrane |
| amniotic fluid | fluid within amniotic sac |
