Prenatal Development and Birth

Chapter 3 Prenatal Development Birth

Prenatal Development
Birth
ThePostpartum Period


The Course of Prenatal Development
The germinalperiod
The germinal period of prenatal development occurs in the first 2 weeks

after conception


It includes
creation of the zygote
Continued cell division
Attachment of the zygote to the uterine wall


Blastocyst inner layer of cells that develops into the embryo


Trophoblast outer layer of cells that provides nutrition
support for the embryo

Typical Prenatal development begins w fertilization ends w birth takesbtwn

266 280 days 38 40 wks
It can be divided into 3 parts
germinal embryonic fetal

, Conception
occurs when a single sperm cell from male unites w an ovum

egg in female's fallopian tube in process called fertilization


Prenatal Development
Begins w fertilization ends w birth
takes btwn 266 280 days 38 to 40weeks

Divided into 3 periods
Germinal
Embryonic
Fetal


Germinal Period of Prenatal Development

takes place during first 2 weeks after conception

Includes
Creation of the fertilized egg called a zygote
Cell divison recall this occurs through a process called mitosis

Attachment of the zygote to uterine wall

Differentiation
specialization of cells to perform various tasks
starts to take place 1 week after conception
Group of cells are now called thegerminal blastocyst



GerminalBlastocyst Theinnerlayer of cellsthat developsduringthe germinalperiod These

cells later develop into the embryo