gamete
mature germ cell, either sperm (male) or ovum (female)
fertilization
beginning of pregnancy, when the sperm enters the ovum. Fertilization normally occurs in the fallopian tubes. (also called conception)
zygote
cell formed by the union of the sperm and the ovum
embryo
unborn offspring in the stage of development from implantation of the zygote to the end of the eighth week of pregnancy. This period is characterized by rapid growth of the embryo.
fetus
unborn offspring from the beginning of the ninth week of pregnancy until birth
gestation
development of a new individual from conception to birth (also called pregnancy)
gestation period
duration of pregnancy
implantation
embedding of the zygote in the uterine lining. The process normally begins about 7 days after fertilization and continues for several days.
placenta
temporary organ attached to the uterine wall that forms during pregnancy and provides oxygen and nutrients to the fetus
amniotic sac
membranous bag that surrounds the fetus before delivery
chorion
outermost layer of the amniotic sac
amnion
innermost layer of the amniotic sac
amniotic fluid
fluid within the amniotic sac
umbilicus
navel (belly button); marks the site of attachment of the umbilical cord to the fetus
amni/o
amnion, amniotic fluid
amnion/o
amnion, amniotic fluid
chori/o
chorion
fet/o
fetus, unborn offspring
gravid/o
pregnancy
lact/o
milk
nat/o
birth
omphal/o
umbilicus, navel
par/o
bear, give birth to, labor, childbirth
part/o
bear, give birth to, labor, childbirth