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  Embryonic period in human pregnancy

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Pregnancy  


Note: Information provided on this page is for reference only, please seek medical assistance when in doubt

The embryonic period in humans begins at fertilization when the male sperm cell penetrates into woman’s egg and this period continues until the end of 10th week of gestation. The period of two weeks from fertilization is also referred to as the germinal stage.

embryonic period

Starting out as a single cell zygote, the embryo spends next few days traveling down the Fallopian tube and then divides several times to form a ball of cells called a morula. Further cellular division is accompanied by the formation of a small cavity between the cells. This stage is called a blastocyst.

Till this point there is no growth in the overall size of the embryo, as it is confined within a glycoprotein shell, instead, each division produces successively smaller cells.

Blastocyst reaches the uterus at roughly the fifth day after fertilization. It is here that lysis of the zona pellucida occurs. This process is analogous to zona hatching, a term that refers to the emergence of the blastocyst from the zona pellucida, when incubated in vitro.

This allows the trophectoderm cells of the blastocyst to come into contact with, and adhere to, the endometrial cells of the uterus. The trophectoderm will eventually give rise to extra-embryonic structures, such as the placenta and the membranes.

The embryo becomes embedded in the endometrium in a process called implantation. In most successful pregnancies, the embryo implants 8 to 10 days after ovulation. The embryo, the extra-embryonic membranes, and the placenta are collectively referred to as a conceptus, or the "products of conception".

Rapid growth occurs and the embryo's main external features begin to take form. This process is called differentiation, which produces the varied cell types such as blood cells, kidney cells, and nerve cells.

In first 10 weeks of gestation the cell divides rapidly and begin to differentiate into the various body systems, 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, during this time, there is also development of structures important to support the embryo, including the placenta and umbilical cord.

Placenta connects the developing embryo to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply while the umbilical cord is the connecting cord from the embryo or fetus to the placenta.


Pregnancy Trimesters

»  First Trimester
»  Second Trimester
»  Third Trimester

Fetal Growth in ...
1st month 2nd month 3rd month 4th month
5th month 6th month 7th month 8th month
9th month 10th month

Fetal Growth in ...
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6
Week 7 Week 8 Week 9 Week 10 Week 11 Week 12
Week 13 Week 14 Week 15 Week 16 Week 17 Week 18
Week 19 Week 20 Week 21 Week 22 Week 23 Week 24
Week 25 Week 26 Week 27 Week 28 Week 29 Week 30
Week 31 Week 32 Week 33 Week 34 Week 35 Week 36
Week 37 Week 38 Week 39 Week 40 Beyond 40 weeks


Also See:
»  Due Date Calculator
»  Ovulation Calculator (When is Ovulation)
»  Fertility Calculator
»  Safe Period Calculator
»  Fetal Growth Calculator
»  Fetal Size Calculator
»  Pregnancy Calendar (Pregnancy Chart)
»  Fetal length and weight chart
»  Pregnancy Weeks (Pregnancy week by week)
»  Pregnancy Months (Pregnancy month by month)
»  Pregnancy Trimester
    -  First Trimester
    -  Second Trimester
    -  Third Trimester



»  How to get Pregnant
»  Pregnancy Overview
»  Signs or Symptoms of Pregnancy
»  Pregnancy Tests
»  When to test for pregnancy
»  Embryonic period in human pregnancy
»  Menstruation
»  What is Ovulation
»  When does Ovulation occurs
»  What is fertile period
»  When is safe period
»  IVF (In vitro fertilization)

 

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