Cells and membranes resulting from fertilization of the ovum at any stage of prenatal development.
Graafian follicle cells remaining after ovulation that produce estrogen and progesterone.
The number of chromosomes (46 in humans) normally present in body cells other than gametes that represents 1 copy of every chromosome from each parent.
The developing baby from the beginning of the third week through the eighth week after conception.
Prenatal age of the developing baby, calculated from the date of conception (Also called postconceptional age).
The developing baby from 9 weeks after conception until birth; used in everyday practice to describe a developing baby during pregnancy, regardless of gestational age.
Prenatal age of the developing baby (measured in weeks) calculated from the first day of the woman's last menstrual period; approximately 2 weeks longer than the fertilization age (Also called menstrual age).
Normal number of chromosomes in male or female gamete; refers to 1 copy of a chromosome from each pair (23 in humans, or half the diploid number).
Fetal structure that provides nourishment and removes wastes from the developing baby and secretes hormones necessary for the continuation of pregnancy.
The X or Y chromosome. Females have two X chromosomes; males have one X and one Y chromosome.