Labour Delivery Model

Labour Delivery Model

1. This series models consists of six development phases and each part shows a state of prenatal cervix and birth canal. The whole model demostrate 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.
2. The orifice of cervix has no expanding, and the cervical tunnels haven't disappeared at all. The positional relation between the head of fetus and the square of ischial spine is - 5 
3. The orifice of cervix has expanded 2 cm bigger, and cervical tunnels disappear 50%. The positional relation between the head of fetus and the square of ischial spine is - 4.  
4. The orifice of cervix has expanded 4 cm bigger, and the cervical tunnels disappear absolutely. The positional relation between the head of fetus and the square of ischial spine is - 3.
5. The orifice and cervix has expanded 5 cm bigger, and the cervical tunnels disappear absolutely. The positional relation between the head of the fetus and the square of ischial  spine is 0.