As respects the child it may arise from,
1. Malposition.
2. Faulty form and size of the child.
3. Faulty condition of the parts which belong to the child.
On the part of the mother this division of dystocia may arise from a faulty condition.
4. Of the pelvis.
5. Of the soft passages.
6. Of the expelling powers.
The second condition where labour is rendered dangerous for the mother or her child, without any obstruction to its progress, may arise from,
1. Following too rapid a course.