Features:

■ The model set consists of modules for six different cervical changes in relation to the birth canal.

■ The set models the size of the dilated cervical opening, the degree of change in the cervical canal, and the position of the fetal head in relation to the plane of the sciatic spine for cervical examination.

■ Changes in each part of the dilatation phase of the first stage of labor:

– Stage 1: There is no dilatation of the cervical opening, no disappearance of the cervical canal, and the position of the fetal head in relation to the plane of the sciatic spine is -5.

– Stage 2: The cervical opening is dilated by 2 cm, the cervical canal has disappeared by 50%, and the position of the fetal head in relation to the plane of the sciatic spine is -4.

– Stage 3: The cervical opening is dilated by 4 cm, the cervical canal has completely disappeared, and the position of the fetal head in relation to the plane of the sciatic spine is -3.

– Stage 4: The cervical opening is dilated by 5 cm, the cervical canal has completely disappeared, and the position of the fetal head in relation to the plane of the sciatic spine is zero.

– Stage 5: The cervical opening is dilated by 7 cm, the cervical canal has completely disappeared, and the position of the fetal head in relation to the plane of the sciatic spine is +2.

– Stage 6: The cervical opening is dilated by 10 cm, the cervical canal has completely disappeared, and the position of the fetal head in relation to the plane of the sciatic spine is +5.