RX-F20G
• This series models consists of six development phases and each part
shows a state of prenatal cervix and birth canal.
• The whole models demonstrate the relations between the scope of the
expanding of the orifice of cervix and the range of cervical tunnels, as
well as the relation between the position of the head of fetus and the
square of ischial spine.
• Six labor phases selected to represent conditions of the cervix and
vagina prior to labor, during labor, and at birth
• Phases demonstrated are:
STA -5 prior to onset of labor;
STA -4 cervix partially effaced;
STA -3 cervix fully effaced;
STA 0 fetal head at plane of ischial spine:
STA +2 cervix nearing full dilation;
STA +5 crowning of fetal head
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