Child Development: 3
Amnion
a bag or envelope and contains a clear fluid in which the developing embryo floats
Fetal Alchol Sprectum Disorders (FASD)
a cluster of abnormalities and problems that appear in the offspring of mothers who drink alochol heavily during pregnancies
Trophoblast
an outer layer of cells that later provides nutrition and support for the embryo.
Teratogen
any agent that can potentially cause a physical birth defect
Placenta
consists of a disk-shaped group of tissues in which small blood vessels from the mother and the offspring intertwine but do not join
Blastocyst
consists of an inner mass of cells that will eventually develop into the ebryo and trophoblast
Umbilical Cord
contains two arteries and one vein that connect the baby to the placenta
Neurons (Nerve Cells)
handle information processing at the cellular level in the brain. By the time babies are born they have 100 billion neurons
Fetal Period
lasting about seven months, is the prenatal period between two months after conception and birth in typical pregnancies.
Implantation
the attachment of the zygote to the uterine wall, takes place about 10-14 days after conception
Neurogenesis
the generation of new neurons
Endoderm
the inner layer of cells, which will develop into the digestive and respiratory systems
Mesoderm
the middle layer which will become the circulatory system, bones, muscles, excretory system, and reproductive system
Organogenesis
the name given to the process of organ formation during the first two months of prenatal development
Ectoderm
the outermost layer which will become the nervous system, and brain, sensory receptors, and skin parts
Embryonic Period
the period of prenatal development that occurs from two to eight weeks after conception
Germinal Period
the period of prenatal development that takes place in the first two weeks after conception. It includes the creation of the fertilized egg (zygote), cell division, and the attachment of the zygote to the uterine wall.