PSY 2010 Chapter Notes -Umbilical Cord, Prenatal Development, Organogenesis
28 May 2023
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Chapter 3
Conception- single sperm unites with ovum in fallopian tube in fertilization.
Prental development- begins with fertilization and ends with birth, 266-280 days (38-40 weeks, 9
months), 3 periods, germinal, embryonic and fetal.
germinal period
The period of prenatal development that takes place in the first two weeks after
conception. It includes the creation of the zygote, continued cell division, and the
attachment of the zygote to the uterine wall.
blastocyst
The inner layer of cells that develops during the germinal period. These cells later
develop into the embryo.
Trophoblast
The outer layer of cells that develops in the germinal period. These cells provide
nutrition and support for the embryo.
embryonic period
The period of prenatal development that occurs from two to eight weeks after
conception. During the embryonic period, the rate of cell differentiation intensifies,
support systems for the cells form, and organs appear.
amnion
Prenatal life-support system that is a bag or envelope containing a clear fluid in which
the developing embryo floats.
umbilical cord
A life-support system that contains two arteries and one vein and connects the baby to
the placenta.
placenta
A life-support system that consists of a disk-shaped group of tissues in which small
blood vessels from the mother and offspring intertwine.
organogenesis
Organ formation that takes place during the first two months of prenatal development.
fetal period
Chapter 3
The period from two months after conception until birth, lasting about seven months in
typical pregnancies.
neurons
Nerve cells, which handle information processing at the cellular level in the brain.
100 billion neurons, nerve cells
Document Summary
Conception- single sperm unites with ovum in fallopian tube in fertilization. Prental development- begins with fertilization and ends with birth, 266-280 days (38-40 weeks, 9 months), 3 periods, germinal, embryonic and fetal. germinal period. The period of prenatal development that takes place in the first two weeks after conception. It includes the creation of the zygote, continued cell division, and the attachment of the zygote to the uterine wall. blastocyst. The inner layer of cells that develops during the germinal period. The outer layer of cells that develops in the germinal period. These cells provide nutrition and support for the embryo. embryonic period. The period of prenatal development that occurs from two to eight weeks after conception. During the embryonic period, the rate of cell differentiation intensifies, support systems for the cells form, and organs appear. amnion. Prenatal life-support system that is a bag or envelope containing a clear fluid in which the developing embryo floats. umbilical cord.
