You probably need to re-word this question. Do you mean if the placenta is over the cervix? If the placenta is over the cervix, then you will have to have a C-section. If that does not answer your...
The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination and gas exchange via the mother's blood supply. (Wikipedia) For the source...
Placenta spuria--placental tissue that has no connection tot he main placenta.
Placenta succenturiate--additional lobe of placental tissue only slightly connected to the main placenta.
neither...