Parts of an Egg/ Embryology
40 weeks
Length of a normal pregnancy.
Implantation
The process by which the zygote attaches to the uterine wall
21 days
Chicken Embryo development- time before hatching
Ovary
a female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair.
amniotic sac
a fluid-filled sac that cushions and protects a developing embryo and fetus in the uterus
Air cell
a pocket of air between the inner and outer membranes that provides chick with first breath
umbilical cord
a tube containing the blood vessels connecting the fetus and placenta
fetal development
begins at the start of the ninth week and continues until birth
Zygote
fertilized egg- The first thing you were! sperm and egg joined.
uterus (womb)
hollow, muscular, pear-shaped organ whose function is to contain the developing fetus
monozygotic twins
identical twins formed when one zygote splits into two separate masses of cells, each of which develops into a separate embryo
Vitelline (Yolk membrane)
membrane that surrounds the yolk
Menstruation
monthly shedding of the uterine lining
Shell membranes (inner and outer)
semi-permeable, flexible layers located just inside the shell
Chalazae
stretchy, white cords that hold the yolk in place
fetus
the developing human organism from 9 weeks after conception to birth
Shell
the hard, outer covering of an egg that contains lots of calcium carbonate
germinal disc
white spot on egg yolk that has the genetic contribution (egg cell) from the hen
3 stages of embryonic development
zygote, embryo, fetus
Thin Albumen
(egg white) watery, clear substance in the egg that is rich in nutrients- especially protein
Placenta
A structure that allows an embryo to be nourished with the mother's blood supply
embryo
An organism in the earliest stage of development up to 8 weeks
Yolk
yellow-orange part of the egg that acts a a food source for the developing chick
Ovum (egg)
Female sex cell (gamete)
Thick Albumen (White)
Major source of egg riboflavin and protein
Fertilization
Process in sexual reproduction in which male and female reproductive cells join to form a new cell
Ovulation
The process of releasing a mature egg into the fallopian tube each month
