Using horizontal direction will just conform to the texture of the skin, which is easier to block.
The operation time is long, the anesthesia requirement is high, and the delivery time of fetal head may be affected by the injured mouth for a long time. Secondly, the transection is limited by the extension of the knife edge, and the observation field inside the operation is limited.
In case of emergency, a vertical incision can also be made under local anesthesia, so that the delivery time of fetal head is shorter and the operation time is shorter, and the internal situation of uterus can be fully observed during the operation.
If it is vertical cutting pain, the lying-in woman may stretch vertically when sitting up, so it may involve the wound and cause pain.
Crosscutting, sitting up may not appear some obvious situations.