Normal Embryology of the Embryonic Period
Normal Ultrasound Parameters during the First Trimester
The Pathology of Trophoblastic Invasion
The Uterus prior to visualization of the gestational sac
The Decidua
The Gestational Sac
The Yolk Sac
The Embryo (normal appearance from 5 to 12 weeks of gestation)
The Membranes - amnion, chorion, and their cavities
Multiple Pregnancies
Estimation of Gestational Age
Maternal serum bhCG levels
MSS (Maternal serum marker screen) or Triple Test
Video Images
