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Fertilization is the event where the egg cell fuses with the male gamete, spermatozoon.
After the point of fertilization, the fused product of the female and male gamete is referred to as a zygote or fertilized egg.
Fertilization can also occur by assisted reproductive technology such as artificial insemination and in vitro fertilisation.
Fertilization (conception) is sometimes used as the initiation of pregnancy, with the derived age being termed fertilization age.
Naegele's rule is a standard way of calculating the due date for a pregnancy when assuming a gestational age of 280 days at childbirth.
The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age.
Through an interplay of hormones that includes follicle stimulating hormone that stimulates folliculogenesis and oogenesis creates a mature egg cell, the female gamete.The basic outlines of the organ, body, and nervous systems are established.By the end of the embryonic stage, the beginnings of features such as fingers, eyes, mouth, and ears become visible.The fertilized egg, known as a zygote, then moves toward the uterus, a journey that can take up to a week to complete.Cell division begins approximately 24 to 36 hours after the female and male cells unite.