The bone shown in this figure is the: 
Definitions:
Germinal Period
The initial two weeks of prenatal development following conception, characterized by rapid cell division and the beginning of cell differentiation.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing baby while removing waste.
Implantation
The process by which a fertilized egg attaches itself to the wall of the uterus, beginning the stages of pregnancy.
Embryonic Period
The stage in prenatal development that spans from conception to the eighth week, during which major organs and structures begin to form in the embryo.
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