Advertisement

What is the embryonic period of the 1st trimester of pregnancy?

Following fertilization the rapidly growing mass of cells, attaches to the uterine wall and forms layers of cells called the embryo. This is the beginning of the embryonic period which occurs between 2 and 8 weeks after conception. This is a time of rapid cell division, movement and differentiation. The inner layer of cells of the embryo is the endoderm which develops into the digestive and respiratory systems, the middle layer of cells or mesoderm develops into the circulatory system, bones, muscles, excretory system and reproductive system and the outer layer of cells or ectoderm becomes the nervous system and sensory receptors. During the embryonic period most of the organ systems are established thus during this period of pregnancy the embryo is very vulnerable and many anomalies are produced during this time.

The third week of pregnancy is usually when your egg is fertilized and your child conceived. After the egg implants in the uterine wall, it remain in an embryonic period from the fifth to the tenth week. This is when most of your baby's organs develop. Your child is a around the size of a sesame seed at week 5, but grows to over an inch long by week ten. The embryonic stage is the most important stage of development because it sets the precedent for the rest of your child's growth and health.

Continue Learning about 1st Trimester Of Pregnancy

Are there any tests I should have during the first trimester of pregnancy?
Brigham and Women's HospitalBrigham and Women's Hospital
  There are a variety of laboratory and sonographic tests for pregnant women that have become routi...
More Answers
What is the duration of the 1st trimester of pregnancy?
Honor Society of Nursing (STTI)Honor Society of Nursing (STTI)
The duration of the 1st trimester of pregnancy usually runs from the third through the twelfth week ...
More Answers
Healthy Pregnancy: Your First Trimester Guide
Healthy Pregnancy: Your First Trimester GuideHealthy Pregnancy: Your First Trimester GuideHealthy Pregnancy: Your First Trimester GuideHealthy Pregnancy: Your First Trimester Guide
This pregnancy guide explains your baby's growth, as well as the aches, weight gain, morning sickness and other changes during the first trimester.
Start Slideshow
What Is Preeclampsia and Its Symptoms?
What Is Preeclampsia and Its Symptoms?

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.