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Embryonic and Fetal Development

Author: Amanda Soderlind

Development Weeks 1-8

Source: Video and Images Created by Amanda Soderlind

Video Transcript

Fetal Development: Second and Third Trimester

Source: Video and Images Created by Amanda Soderlind

Video Transcript

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Terms to Know
Embryonic Disk

Part of the inner cell mass of the blastocyst, the embryonic disk is the cellular framework that begins embryonic development; the nervous system develops from a cell layer within called the ectoderm.

Fetus

The developing baby after the first eight weeks of development up to birth.

First Trimester

Marks the start of the pregnancy through the first 13 weeks, where the fertilized egg implants in the uterus and develops into an embryo.

Miscarriage

Also called spontaneous abortion, a miscarriage is when the embryo is expelled from the uterus.

Neural Tube

A tube formed from the ectoderm of the blastocyst that serves as the framework for the development of the central nervous system (brain and spinal cord).

Second Trimester

Marks the start of the fourth month until the end of the sixth month of pregnancy in which the fetus continues to develop as organs and organ systems mature.

Sex Chromosomes

The X & Y chromosomes that when paired determine the gender of the child and carry other genetic traits as well; XX = female while XY = male.

Third Trimester

Marks the seventh month of pregnancy until birth, and is characterized by the continued development of the fetus as it prepares for birth.