ANTEPARTUMStages of Pregnancy•The third through eighth weeks after conception are called the embryonic stage.•The fetal period starts 9 weeks after conception and laststhrough the end of gestation.Fetal Development: Embryonic StageWeek 1•Free-floating blastocystWeeks 2 to 3•The embryo is 1.5 to 2 mm long.•Lung buds appear.•Blood circulation begins.•The heart is tubular.•The neural plate becomes thebrainand spinal cord.Week 5•The embryo is 0.4 to 0.5 cm long.•The embryo weighs 0.4 g.•Double heart chambers are visible.•The heart beats.•Limb buds begin to form.Week 8•The embryo is 3 cm long.•The embryo weighs 2 g.•The eyelids begin to fuse.•The circulatory system through theumbilical cord is well established.VERSION 5Preview Mode
This document has 45 pages. Sign in to access the full document!
